"Purpose of REUSE_ALV_FIELDCATALOG_MERGE"

What is the purpose of "REUSE_ALV_FIELDCATALOG_MERGE" function module in ALV Reports?

Hi,
Let say I ask you to Prepare a ALV with all fields of the Table MARA and two fields from different Table.
Then there is no point of you creating the Field Catalogue for 70(approx) fields of MARA and then Two other fields, inspite of this you just create a Zstrucutre for those Two fields and in the FM REUSE_ALV_FIELDCATALOG_MERGE pass this Strucutre and the MARA strucutre and in the resultant Field Catalogue , you will have the complete fields of MARA and these Two Extra fields.
In this Way you will save yourself from a lot of Redundant Code.
This function module is used to pass the field catalog to the report output and merge it with the internal output table.
FUNCTION reuse_alv_fieldcatalog_merge.                                
*u201D IMPORTING                                                    
*"   VALUE(I_PROGRAM_NAME) LIKE  SY-REPID OPTIONAL          
*"  VALUE(I_INTERNAL_TABNAME) TYPE  SLIS_TABNAME OPTIONAL  
*"  VALUE(I_STRUCTURE_NAME) LIKE  DD02L-TABNAME OPTIONAL   
*"  VALUE(I_CLIENT_NEVER_DISPLAY) TYPE  SLIS_CHAR_1 default u2018Xu2019
*"   VALUE(I_INCLNAME) LIKE  TRDIR-NAME OPTIONAL            
*"   CHANGING                                                     
*"         VALUE(CT_FIELDCAT) TYPE  SLIS_T_FIELDCAT_ALV           
*"   EXCEPTIONS                                                   
*"              INCONSISTENT_INTERFACE                                
*"              PROGRAM_ERROR                                         
Import parameters 
I_PROGRAM_NAME: Program in which the internal output table is declared and populated   
I_INTERNAL_TABNAME: Internal output table name
I_STRUCTURE_NAME: Structure name (structure, table, and view)
I_CLIENT_NEVER_DISPL: Hide client fields default u2018Xu2019
I_INCLNAME: Data declarations include name
CHANGING parameter
CT_FIELDCAT: Field catalog with field descriptions

Similar Messages

  • Purpose ofReuse_alv_variant_default_get&variant_F4&alv_variant_existence FM

    Hi Experts,
    Can any one of use pls calrify my doubt:
    I am hearing to that <b>while i am using  alv report when i execute this display will come and then i click display layout it save as a variant on the selection screen and when i go back to selection screen and press f4 on the display variant its show the drop down list of varient.</b>
    Ple calrify me that what this variant hold either layout set on any values of selection scren like normal variant of selection screen.
    Reuse_alv_variant_default_get:
    Provides the default variant for the list specified in the structure parameter CS_VARIANT of a program.
    Reuse_alv_variant_F4:
    Display variant selection dialog box. Possible entries help, if the variant is defined explicitly as an input field on a screen. The selection must be specified by at least partially filling the parameter structure IS_VARIANT.
    Reuse_alv_variant_existence:
    This function module checks the existence in the database of a display variant passed in the interface.
    PARAMETERS: pa_vari TYPE disvariant-variant.
    data:g_repid like sy-repid,
    e_variant type disvariant.
    INITIALIZATION.
    g_repid = sy-repid.
    CLEAR e_variant.
    e_variant-report = sy-cprog.
    e_variant-username = sy-uname.
    CALL FUNCTION 'REUSE_ALV_VARIANT_DEFAULT_GET'
    EXPORTING
    i_save = 'A'
    CHANGING
    cs_variant = e_variant
    EXCEPTIONS
    not_found = 2.
    IF sy-subrc = 0.
    pa_vari = e_variant-variant.
    ENDIF.
    AT SELECTION-SCREEN ON VALUE-REQUEST FOR pa_vari.
    PERFORM alv_variant_f4 CHANGING pa_vari.
    *& Form ALV_VARIANT_F4
    FORM alv_variant_f4 CHANGING pa_vari.
    DATA: l_exit(1) TYPE c.
    CALL FUNCTION 'REUSE_ALV_VARIANT_F4'
    EXPORTING
    is_variant = e_variant
    i_tabname_header = 'ANYTHING'
    i_save = 'A'
    IMPORTING
    e_exit = l_exit
    es_variant = e_variant
    EXCEPTIONS
    not_found = 2.
    IF sy-subrc = 2.
    MESSAGE ID sy-msgid TYPE 'S' NUMBER sy-msgno
    WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    ELSE.
    IF l_exit = space.
    pa_vari = e_variant-variant.
    ENDIF.
    ENDIF.
    ENDFORM. " ALV_VARIANT_F4

    Hi
    1. The ALV Grid Control is a tool with which you can output non-hierarchical lists in a
    standardized format. The list data is displayed as a table on the screen.
    The ALV Grid Control offers a range of interactive standard list functions that users need
    frequently (find, sort, filter, calculate totals and subtotals, print, print preview, send list,
    export list (in different formats), and so on. These functions are implemented in the
    proxy object class. You as the programmer have the possibility to turn off functions not
    needed. In most cases the implementations of the standard functions provided by the
    control are sufficient. However, if required, you can adjust these implementations to
    meet application-specific needs.
    You can add self-defined functions to the toolbar, if necessary.
    The ALV Grid Control allows users to adjust the layout of lists to meet their individual
    requirements (for example, they can swap columns, hide columns, set filters for the
    data to be displayed, calculate totals, and so on). The settings (list customizing) made
    by a specific user are called a display variant. Display variants can be saved on a userspecific
    or on a global basis. If such display variants exist for a list, they can be offered
    to the user for selection. If a display variant is set as the default variant, the associated
    list is always displayed based on the settings of this variant.
    2. REUSE_ALV_LIST_DISPLAY
    REUSE_ALV_GRID_DISPLAY
    REUSE_ALV_FIELDCATALOG_MERGE
    REUSE_ALV_COMMENTARY_WRITE
    3. Use of Field Catalog is to determines the technical properties & add formating information of the column.
    6. all the definition of internal table, structure, constants are declared in a type-pool called SLIS.
    7.fieldcat-fieldname
    fieldcat-ref_fieldname
    fieldcat-tabname
    fieldcat-seltext_m
    5. Form user_command using r_ucomm like sy-ucomm rs_selfield type slis_selfield.
    Sap provides a set of ALV (ABAP LIST VIEWER) function modules which can be put into use to embellish the output of a report. This set of ALV functions is used to enhance the readability and functionality of any report output. Cases arise in sap when the output of a report contains columns extending more than 255 characters in length. 
    In such cases, this set of ALV functions can help choose selected columns and arrange the different columns from a report output and also save different variants for report display. This is a very efficient tool for dynamically sorting and arranging the columns from a report output. 
    The report output can contain up to 90 columns in the display with the wide array of display options.
    The commonly used ALV functions used for this purpose are;
    1. REUSE_ALV_VARIANT_DEFAULT_GET
    2. REUSE_ALV_VARIANT_F4
    3. REUSE_ALV_VARIANT_EXISTENCE
    4. REUSE_ALV_EVENTS_GET
    5. REUSE_ALV_COMMENTARY_WRITE
    6. REUSE_ALV_FIELDCATALOG_MERGE
    7. REUSE_ALV_LIST_DISPLAY
    8. REUSE_ALV_GRID_DISPLAY
    9. REUSE_ALV_POPUP_TO_SELECT
    Purpose of the above Functions are differ not all the functions are required in all the ALV Report. 
    But either no.7 or No.8 is there in the Program. 
    How you call this function in your report?
    After completion of all the data fetching from the database and append this data into an Internal Table. say I_ITAB.
    Then use follwing function module.
    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
           EXPORTING
                I_CALLBACK_PROGRAM       = 'Prog.name'
                I_STRUCTURE_NAME         = 'I_ITAB'
                I_DEFAULT                = 'X'
                I_SAVE                   = 'A'
           TABLES
                T_OUTTAB                 = I_ITAB.
      IF SY-SUBRC <> 0.
        WRITE: 'SY-SUBRC: ', SY-SUBRC .
      ENDIF.
    ENDFORM.                    " GET_FINAL_DATA
    Reward all helpfull answers
    Regards
    Pavan

  • Reuse_alv_fieldcatalog_merge    when we use it.

    hi to all
    .what is the pupose of reuse_alv_events_get, and reuse_alv_fieldcatalog_merge when we use it.
    pls tell purpose of theese two fun modules in words .and also give some simple example programs.(not comlex examples )

    Hi,
    Description
    This table tells ALV which events are processed by the caller by CALLBACK.
    The table of possible events per list type can be initialized using the module REUSE_ALV_EVENTS_GET.
    You can display the names of the constants in the type pools SLIS which represent the individual events using the individual test function in the function module
    REUSE_ALV_EVENT_NAMES_GET. Only events with a form routine name are processed.
    The table structure contains the fields:
    •     IT_EVENTS-NAME
    Name of the Callback event.
    Possible Callback events:
    •     Action
    USER_COMMAND USING R_UCOMM LIKE SY-UCOMM RS_SELFIELD TYPE SLIS_SELFIELD
    Process actions on the list
    As this is a frequently-used Callback event, the form routine can also be passed directly in the interface in the IMPORTING parameter I_CALLBACK_USER_COMMAND.
    PF_STATUS_SET USING RT_EXTAB TYPE SLIS_T_EXTAB
    If a user list status is to be set, it must be done in the form routine assigned to this event. The ALV function codes, which must not be active, are in the Parameter RT_EXTAB. This table must be passed with the SET PF-STATUS command (with inactive user function codes as well, if necessary).
    The STANDARD status of the function group SALV should be used as a template for a user-specific status.
    As this is a frequently-used Callback event, its form routine can also be passed directly in the interface in the IMPORTING parameter I_CALLBACK_PF_STATUS_SET.
    ITEM_DATA_EXPAND USING RS_SELFIELD TYPE SLIS_SELFIELD RFLG_ALL TYPE C
    Only relevant for hierarchical-sequential lists using the layout parameter IS_LAYOUT-EXPAND_FIELDNAME of the structure IS_LAYOUT.
    Exit for passing item entries (ITEM table) for a header record which was expanded interactively by the user.
    RS_SELFIELD-TABINDEX contains the header table index for which the item entries are to be put in the global item output table (T_OUTTAB_SLAVE). The Callback is only called if ALV has no items for a header which is to be expanded.
    RFLG_ALL is passed with 'X' if the user shows all items. The application must ensure that entries are not repeated in the item table. RS_SELFIELD is initial in this case.
    CALLER_EXIT USING RS_DATA Is called at the beginning of the function module to make special settings. It is not usually used.
    •     List processing events
    IMPORTANT: The application Callback routine must not manipulate the internal output table and/or its header record. This restriction applies to all Callbacks which are called in the list output and run under the 'List processing events'.
    TOP_OF_LIST no USING parameter. Information output at the start of the list
    END_OF_LIST no USING parameter. Information output at the end of the list
    TOP_OF_PAGE no USING parameter
    Equivalent to the list processing TOP-OF-PAGE event
    END_OF_PAGE no USING parameter. Not available for hierarchical-sequential lists.
    Information output at the end of a page. This is only called for printing.
    TOP_OF_COVERPAGE no USING parameter
    The selection information and list status are output together (if they exist) on a separate page by default. See also the documentation of the parameters:
    IS_PRINT-NO_COVERPAGE
    IS_PRINT-NO_PRINT_SELINFOS
    IS_PRINT-NO_PRINT_LISTINFOS
    IS_LAYOUT-GET_SELINFOS
    The user can format the header area of the 'cover page' himself or herself by specifying a Callback routine for this event.
    END_OF_COVERPAGE no USING parameter
    Analogously to TOP_OF_COVERPAGE the user can add other information to the information output by ALV (selection information, list status) at this event.
    FOREIGN_TOP_OF_PAGE no USING parameter
    The Top-of-page event is always processed in ALV and is only passed to the caller via the Callback mechanism. This is still the case if the caller, e.g. by a user action, processes a branch list which was not formatted by ALV (e.g. a popup with additional information about the list record selected and displayed by ALV).
    In this case, top-of-page cannot be formatted by ALV analogously to the basic list, it must be handled completely by the caller. The event top-of-page still occurs in ALV. When ALV notices a top-of-page which was not caused by an ALV output, the form routine in FOREIGN_TOP_OF_PAGE is called.
    FOREIGN_END_OF_PAGE no USING parameter
    The event end-of-page is always processed in ALV and only passed to the caller via callback. This is still the case, e.g. when the caller processes a details list which was not formatted by ALV (e.g. a popup with further information about selected list records which were displayed by ALV).
    In this case, end-of-page cannot be formatted by ALV analogously to the basic list, it must be handled completely by the caller. The event end-of-page still occurs in ALV. When ALV notices an end-of-page that was not caused by an ALV output, the form routine in FOREIGN_END_OF_PAGE is called.
    BEFORE_LINE_OUTPUT USING RS_LINEINFO TYPE SLIS_LINEINFO
    Output information before each output line. Should only be used in justified cases because it costs a lot of performance.
    AFTER_LINE_OUTPUT USING RS_LINEINFO TYPE SLIS_LINEINFO
    Output information after each output line. Should only be used in justified cases because it costs a lot of performance.
    •     Internal use only
    LIST_MODIFY USING R_TABNAME TYPE SLIS_TABNAME
    R_INDEX LIKE SY-TABIX
    R_INDEX_ITEM LIKE SY-TABIX
    R_INDEX_SUM LIKE SY-TABIX
    •     IT_EVENTS-FORM
    Name of the form routine which should be called in the calling program at the event.
    Field_catalog:
    Field catalog with field descriptions
    2.7.1.     Description
    Field catalog containing descriptions of the list output fields (usually a subset of the internal output table fields). A field catalog is required for every ALV list output.
    The field catalog for the output table is built-up in the caller's coding. The build-up can be completely or partially automated by calling the REUSE_ALV_FIELDCATALOG_MERGE module
    See also the documentation of the function module REUSE_ALV_FIELDCATALOG_MERGE.
    The minimal field catalog is documented under 'default'. The caller can use the other optional parameters to assign output attributes to a field which differ from the default.
    A field catalog need not be built-up and passed explicitly only under the following conditions:
    •     The internal table to be output has the same structure as a Data Dictionary structure which is referred to in the internal table declaration using LIKE or INCLUDE STRUCTURE.
    •     all fields in this structure are to be output
    •     the structure name is passed to ALV in the parameter I_STRUCTURE_NAME.
    See also the documentation of the IMPORTING paramter I_STRUCTURE_NAME.
    Positioning
    •     row_pos (row position)
    value set: 0, 1 - 3
    Only relevant if the list output is to be multi-line (two or three lines) by default.
    A multi-line list can also be defined by the user interactively if the default list is one-line.
    The parameter specifies the relative output line of the column in a multi-line list.
    •     col_pos (column position)
    value set: 0, 1 - 60
    only relevant when the default relative column positions differ from the field catalog field sequence. The parameter specifies the relative column position of the field in the list output. The column order can be changed interactively by the user. If this parameter is initial for all field catalog entries, columns appear in the field catalog field sequence.
    Identification
    •     fieldname (field name)
    value set: internal output table field name (required parameter)
    Name of the internal output table field which is described by this field catalog entry
    •     tabname (internal output table)
    value set: SPACE, internal output table name
    This parameter is used in 'manual' field catalog build-up only for hierarchical-sequential lists.
    Name of the internal output table which contains the field FIELDCAT-FIELDNAME.
    Data Dictionary reference
    •     ref_fieldname (reference field name)
    value set: SPACE, Data Dictionary field name
    Name of the Data Dictionary field referred to.
    This parameter is only used when the internal output table field described by the current field catalog entry has a reference to the Data Dictionary (not a program field), and the field name in the internal output table is different from the name of the field in the Data Dictionary. If the field names are identical, naming the Data Dictionary structure or table in the FIELDCAT-REF_TABNAME parameter is sufficient.
    •     ref_tabname (reference table/structure field name)
    value set: SPACE, name of a Data Dictionary structure or table
    Structure or table name of the referred Data Dictionary field.
    This parameter is only used when the internal output table field described by the current field catalog entry has a Data Dictionary reference (not a program field).
    Reference to fields with currency/measurement unit
    Each internal output table sum or quantity field whose decimal places are to be formatted appropriately for the unit in the list must follow the convention:
    •     the field is of data type QUAN or CURR (internal type P) (the field must really have this physical data type. Overwriting the physical data type with the parameter FIELDCAT-DATATYPE has no effect)
    •     There is a field in the internal output table which contains the associated unit.
    •     There is also an entry in the field catalog for the unit field.
    (If the unit is not to appear as a column in the list, and cannot be interactively displayed as a column, e.g. because it is always unambiguous and is therefore explicitly output by the caller in the list header, the field catalog units field entry can take the parameter FIELDCAT-TECH = 'X'.
    The association of a value field to a unit affects the output as follows:
    •     appropriate decimal places display for the unit
    •     an initialized field with a link to a non-initial unit is output as '0' for the unit (if FIELDCAT-NO_ZERO is initial). When this field is summed, this unit affects whether the units are homogeneous.
    •     an initialized field with a link to an initial unit is output as SPACE. When this field is summed, the unit SPACE does not affect the homogeneity of the units.
    •     When non-initial fields with an initial unit are summed, the unit SPACE is considered to be a unit.
    Link to currency unit
    •     cfieldname (currency unit field name)
    value set: SPACE, output table field name
    Only relevant for amount columns with associated unit.
    Name of the internal output table field containing the currency unit associated with the amount field FIELDCAT-FIELDNAME. The field in FIELDCAT-CFIELDNAME must have its own field catalog entry.
    •     ctabname (internal currency unit field output table)
    value set: SPACE, output table field name
    only relevant for hierarchical-sequential lists
    Name of the internal output table containing the FIELDCAT-CFIELDNAME field.
    Link to measurement unit
    •     qfieldname (measurement unit field name)
    value set: SPACE, output table field name
    only relevant for quantity columns with unit link.
    Name of the internal output table field containing the measurement unit associated with the quantity field FIELDCAT-FIELDNAME.
    The field in FIELDCAT-QFIELDNAME must have its own field catalog entry.
    •     qtabname (internal measurement unit field output table)
    value set: SPACE, output table field name
    only relevant for hierarchical-sequential lists
    Name of the internal output table containing the FIELDCAT-QFIELDNAME field.
    Column output options
    •     outputlen (column width)
    value set: 0 (initial), n
    For fields with a Data Dictionary link this parameter can be left initial.
    For fields without a Data Dictionary link (program field) the parameter must be given the value of the desired field list output length (column width).
    initial = column width is the output length of the referred Data Dictionary field (domain).
    n = column width is n characters
    •     key (key column)
    value set: SPACE, 'X'           'X' = kex field (key field output in color)
    Key fields can not be interactively hidden. Parameter FIELDCAT-NO_OUT must be left initial.
    For exceptions see the documentation of the FIELDCAT-KEY_SEL parameter.
    •     key_sel (hideable key column)
    value set: SPACE, 'X'
    only relevant when FIELDCAT-KEY = 'X'
    Key field which can be hidden interactively.
    The key column sequence cannot be changed interactively by the user.
    The output is controlled by the FIELDCAT-NO_OUT parameter analogously to non-key fields.
    •     no_out (field in field list)
    value set: SPACE, 'X'          'X' = field is not displayed in the current list.
    The user can interactively choose the field for output from the field list.
    The user can display the contents of these fields at line level using the 'Detail' function.
    See also the 'Detail screen' documentation of the parameter IS_LAYOUT.
    •     tech (technical field)
    value set: SPACE, 'X'          'X' = technical field
    Field cannot be output in the list and cannot be displayed interactively.
    Field can only be used in the field catalog (not in IT_SORT, ...).
    •     emphasize (highlight columns in color)
    value set: SPACE, 'X' or 'Cxyz' (x:'1'-'9'; y,z: '0'=off '1'=on)
    'X' = column is colored with the default column highlight color.
    'Cxyz' = column is colored with a coded color:
    •     C: Color (coding must begin with C)
    •     x: color number
    •     y: bold
    •     z: inverse
    •     hotspot (column as hotspot)
    value set: SPACE, 'X'
    'X' = column cells are output as hotspots
    •     fix_column (fix column)
    value set: SPACE, 'X'
    Not relevant for block lists (output of several lists consecutively)
    'X' = column fixed (does not scroll horizontally)
    All columns to be fixed must have this flag, starting from the left. If a column without this flag is output, only the columns to the left of this column are fixed. The user can change the column fixing interactively. See also the documentation of the Layout parameter
    IS_LAYOUT-NO_KEYFIX of the IMPORTING paramter IS_LAYOUT.
    •     do_sum (sum over column)
    value set: SPACE, 'X'           'X' = a sum is to be calculated over this internal output table field.
    This function can also be called by the user interactively.
    •     no_sum (sums forbidden)
    value set: SPACE, 'X'          'X' = no sum can be calculated over this field, although the data type of the field would allow summing.
    •     input (column ready for input)
    Function not available
    Format column contents
    •     icon
    value set: SPACE, 'X'           'X' = column contents to be output as an icon.
    The caller must consider the printability of icons.
    •     symbol
    value set: SPACE, 'X'          'X' = column contents are to be output as a symbol.
    The internal output table column must be a valid symbol character.
    The caller must consider the printability of symbols.
    Symbols can usually be printed, but may not always be output correctly, depending on the printer configuration.
    •     just (justification)
    value set: SPACE, 'R', 'L', 'C'
    Only relevant for fields of data type CHAR or NUMC
    ' ' = default justification for this data type
    'R' = right-justified output
    'L' = left-justified output
    'C' = centered output
    The justification of the column header always follows the justification of the columns. Independent justification of the column neader is not possible.
    •     lzero (leading zeros)
    value set: SPACE, 'X'
    Only relevant for fields of data type NUMC
    ALV outputs NUMC fields right-justified without leading zeros by default.
    'X' = output with leading zeros
    Note: If a NUMC field is output left-justified or centered by FIELDCAT-JUST, leading zeros are output. If the output of leading zeros is suppressed by a Data Dictionary reference ALPHA conversion exit, the output is always left-justified.
    •     no_sign (no +/- sign)           Only relevant for value fields
    value set: SPACE, 'X'     'X' = value output without +/ sign
    •     no_zero (suppress zeros)           Only relevant for value fields
    value set: SPACE, 'X'          'X' = suppress zeros
    •     edit_mask (field formatting)
    value set: SPACE, template
    template = see documentation of WRITE formatting option USING EDIT MASK template
    The output conversion conv can be made by template = '== conv'.
    Texts
    The following text parameters should be specified for program fields without a Data Dictionary reference. The texts are taken from the Data Dictionary for fields with a Data Dictionary reference. If this is not desired, the text parameters can also be specified. The Data Dictionary texts are then ignored. If the user changes the column width interactively, the column header text with the appropriate length is always used. The interactive function 'Optimize column width' takes account of both the field contents and the column headers: if all field contents are shorter than the shortest column header, the column width depends on the column header.
    The 'long field label' is also used in display variant definition, sort, etc. popups.
    •     seltext_l (long field label)
    •     seltext_m (medium field label)
    •     seltext_s (short field label)
    •     reptext_ddic (header)
    analogous to the Data element maintenance 'Header'
    The specified text is not necessarily output in the list, an optimum among all texts is sought.
    •     ddictxt (specify text)
    value set: SPACE, 'L', 'M', 'S'
    You can specify with values 'L', 'M', and 'S', the keyword that should always be used as column header. If the column width changes, no attempt is made in this case to find an appropriate header for the new output width.
    Parameters for program fields without Data Dictionary reference
    see also 'Text' parameters
    •     datatype (data type)
    value set: SPACE, Data Dictionary data type (CHAR, NUMC,...)
    Only relevant for fields without Data Dictionary reference
    Program field data type
    •     ddic_outputlen (external output length)
    value set: 0 (initial), n
    Only relevant for fields without Data Dictionary reference whose output is nevertheless to be modified by a conversion exit.
    Prerequisites:
    •     FIELDCAT-EDIT_MASK = '==conv'
    see also the documentation of the parameter FIELDCAT-EDIT_MASK
    •     FIELDCAT-INTLEN = n
    see also the documentation of the parameter FIELDCAT-INTLEN
    n = external format field output length
    The column width FIELDCAT-OUTPUTLEN need not be the same as the external format output length (FIELDCAT-DDIC_OUTPUTLEN).
    •     intlen (internal output length)
    value set: 0 (initial), n
    Only relevant for fields without Data Dictionary reference whose output is nevertheless to be modified by a conversion exit.
    Prerequisites:
    •     FIELDCAT-EDIT_MASK = '==conv'
    see also the documentation of the parameter FIELDCAT-EDIT_MASK
    •     FIELDCAT-DDIC_OUTPUTLEN = n
    see also the documentation of the parameter FIELDCAT-DDIC_OUTPUTLEN
    n = internal format field output length
    •     rollname (data element)
    value set: SPACE, Data Dictionary data element name
    F1 help can be provided for a program field without a Data Dictionary reference, or F1 help which differs from the Data Dictionary help can be provided for a field with a Data Dictionary reference, using this parameter.
    When F1 help is called for this field, the documentation of the specified data element is displayed.
    If the FIELDCAT-ROLLNAME is initial for fields with a Data Dictionary reference, the documentation of the data element of the referred Data Dictionary field is output.
    Others
    •     sp_group (field group key)
    value set: SPACE, CHAR(1)
    Field group key.
    Keys are assigned to group names in the IT_SPECIAL_GROUPS parameter (see also the documentation of the parameter IT_SPECIAL_GROUPS).
    When such an assignment is made in the field catalog and in IT_SPECIAL_GROUPS, the fields are grouped correspondingly in the display variant popup.
    •     reprep (Report/Report interface selection criterion)
    value set: SPACE, 'X'
    Prerequisites:
    •     The system contains the Report/Report interface (function group RSTI, table TRSTI)
    •     Parameter LAYOUT-REPREP = 'X'
    (see also the documentation of the parameter LAYOUT-REPREP of the IMPORTING parameter IS_LAYOUT )
    'X' = When the Report/Report interface is called, the value of this field is passed in the selected interface start record as a selection criterion.
    2.7.2.     Default
    •     The following entries are usually sufficient for internal table fields with a reference to a field defined in the Data Dictionary :
    •     fieldname
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          i_inclname             = gv_repid
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        EXCEPTIONS
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          program_error          = 2
          OTHERS                 = 3.
      IF sy-subrc <> 0.
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