HOW TO IMPLEMENT SCREEN VALIDATION IN LDB?

Hi,
I am making use of Logical Database in my report, and I want to do screen validation with the screen which already exists in the system? Is it possible to do so? If yes, then how? The LDB, I am using is PSJ.
Also, I would like to know, can we define our own selection screen incase of LDB? How is that possible if the answer is yes to it.BUt here I am not talking about dynamic selection screen. What I mean to say is that..., can we restrict the selection screen in LDB, by defining the fields which are required in the selection screen on execution of the report?
Someone, please guide.
Points will be rewarded for a satisfactory answer.
Thanks & Regards,
Ravi

Hi Ravi,..
Chk out the link - http://help.sap.com/saphelp_erp2005/helpdata/en/60/183d78163011d2953c0000e8353423/frameset.htm
Yes, we can define our own selection screen and that will come right below your LDB selection screen.
AND also LDB selection screen can be restricted ..for this you have to code in PBO of report for hiding the elements which u don't required.
Regards
Mithlesh

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AT SELECTION-SCREEN - selscreen_event
Syntax
| { ON {para|selcrit} }
| { ON END OF selcrit }
| { ON BLOCK block }
| { ON RADIOBUTTON GROUP radi }
| { }
| { ON {HELP-REQUEST|VALUE-REQUEST}
|   FOR {para|selcrit-low|selcrit-high} }
| { ON EXIT-COMMAND }.
Alternatives:
1. ... OUTPUT
2. ... ON {para|selcrit}
3. ... ON END OF selcrit
4. ... ON BLOCK block
5. ... ON RADIOBUTTON GROUP radi
6. ... { }
7. ... ON {HELP-REQUEST|VALUE-REQUEST} FOR
      {para|selcrit-low|selcrit-high} }
8. ... ON EXIT-COMMAND
Effect
These additions allow individual evaluation of specific elements of the selection screens of the program. The information as to which selection has triggered the event is contained in the system field sy-dynnr.
Alternative 1
... OUTPUT
Effect
This event is triggered at the screen event PBO of a selection screen. In the event block, the selection screen can be prepared through assignments to the data objects of parameters and selection criteria and through dynamic screen modifications.
Note
The assignments to input fields in the event block AT SELECTION-SCREEN OUTPUT always affect the selection screen and overwrite the user inputs from previous displays of the same selection screen. Assignments in the event blocks LOAD-OF-PROGRAM oder INITIALIZATION, on the other hand, only have an effect at first program start.
Alternative 2
... ON {para|selcrit}
Effect
This event is triggered at the screen event PAI of a selection screen if the content of the input field of a parameter para or a line of a selection criterion selcrit was passed to the ABAP program. In the event block, the user input can be checked. Sending a warning or an error message in the event block makes the fields para and selcrit ready for input again.
No parameter that is defined as a radio button can be specified. For this purpose, the addition ON RADIOBUTTON GROUP is provided.
Note
If a user action takes place in the dialog box for the multiple selection of a selection criterion selcrit, the entries of the selection table are passed to the program, line by line. For each line, the event AT SELECTION-SCREEN ON selcrit is triggered.
Alternative 3
... ON END OF selcrit
Effect
This event is triggered after the selection table selcrit has been fully passed to the program after a user action in the dialog box for the multiple selection has taken place. In the event block, the entire selection table can be checked.
Alternative 4
... ON BLOCK block
Effect
This event is triggered at the screen event PAI of a selection screen if all the input fields of a block block of the selection screen were passed to the ABAP program. In the event block, the user inputs can be checked. Sending a warning or an error message in the event block makes all the fields of the block block ready for input again.
Alternative 5
... ON RADIOBUTTON GROUP radi
Effect
This event is triggered at the screen event PAI of a selection screen if all the fields of a radio button group radi of the selection screen were passed to the ABAP program. In the event block, the user input can be checked. Sending a warning or error message in the event block makes all the radion buttons of the block radi ready for input again.
Note
The individual fields of a radio button group are not passed individually and do not trigger the event AT SELECTION-SCREEN ON par.
Alternative 6
Effect
The event AT SELECTION-SCREEN itself is triggered as the last event of selection screen processing if all the input values were passed to the program. In this event block, all the user inputs can be checked. Sending a warning or an error message in the event block makes all the screen fields ready for input once again.
Alternative 7
... ON { HELP-REQUEST | VALUE-REQUEST } FOR
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Effect
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Notes
These event blocks can only be implemented for fields of the selection screen that are defined in the same ABAP program and not in a possibly linked logical database.
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Alternative 8
... ON EXIT-COMMAND
Effect
This event is triggered if the user has called one of the functions Back, Exit or Cancel. In the event block, possible clean-up actions can be executed.
Example
In these executable programs, a standard selection screen and a further selection screen are defined. In the event blocks AT SELECTION-SCREEN, the inputs in the selection screens can be specially handled using the name p_carrid and the screen number in sy-dynnr.
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Global data
DATA: sflight_tab TYPE TABLE OF sflight,
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Selection screens
PARAMETERS p_carrid TYPE spfli-carrid.
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SELECT-OPTIONS s_conn FOR sflight_wa-connid.
DATA s_conn_wa LIKE LINE OF s_conn.
SELECTION-SCREEN END OF SCREEN 500.
Handling selection screen events
AT SELECTION-SCREEN ON p_carrid.
IF p_carrid IS INITIAL.
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ENDIF.
AUTHORITY-CHECK OBJECT 'S_CARRID'
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                      ID 'ACTVT' FIELD '03'.
IF sy-subrc = 4.
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ELSEIF sy-subrc <> 0.
    MESSAGE 'Error in authority check' TYPE 'A'.
ELSE.
    IF sy-ucomm = 'ONLI'.
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ENDIF.
AT SELECTION-SCREEN.
IF sy-dynnr = '0500'.
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      SELECT *
             FROM sflight
             INTO TABLE sflight_tab
             WHERE carrid = p_carrid AND
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      ENDIF.
    ENDIF.
ENDIF.
Main program
START-OF-SELECTION.

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>
Pavan Bhamidipati wrote:
> Hi,
>
>
I have to fill those dynamic fields for which the user has entered the value in selection screen.
>
>
> This means that the user is going to enter the values in the selection screen for the dynamic field values so
>
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>
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>
> Regards
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