Select field 'B' based on field 'A'

Hi,
I have a report with selection screen. I want to display the list of possible entries for field 'B' as per the value in field 'A'.
I am doing this on event
"Selection screen on value-request for 
using functional module
'REUSE_ALV_POPUP_TO_SELECT'
Everything is fine except one problem.
Let's take a example that screen has two fields
A).
parsmeters: p_vbeln like vbap-vbeln.
"Sales order number
B).
parameters: p_posnr like vbap-posnr.
"line item
Based on sales order number i have to show an popup with corresponding line item numbers. and i have coded this under,
Selection screen on value-request for POSNR
Scenario 1: i enter the sales order number in the field p_vbeln and hit enter
when i do F4 on p_posnr, it displays the popup with corresponding line items.
This works fine
Scenario 2: i just type in the sales order number and do not hit enter or anything)
Now if i do F4 on p_posnr, it doesn't display the line items, since there is not value populated in p_vbeln as entered it but did not press enter.
I hope i am making sense.
So, my problem is how display possible value for field 'B' if user type in the value in field 'A' but do not hit enter.
Please let me know.
Thanks,
Pal

*-- F4 help for Payroll Administrator
AT SELECTION SCREEN ON VALUE REQUEST FOR P_SACHA.
    PERFORM VALUES_SACHA.
*-- F4 help for Pay Scale Group
AT SELECTION SCREEN ON VALUE REQUEST FOR P_TRFGR.
*-- F4 help for Pay Scale Level
AT SELECTION SCREEN ON VALUE REQUEST FOR P_TRFST.
     FORM VALUES_SACHA
      Provide popup help for the Payroll Admin field
FORM VALUES_SACHA.
REFRESH: LTAB_DYNPSELECT,
           LTAB_DYNPVALUETAB.
PERFORM READ_VALUE_FROM_SCREEN USING SY-REPID
                   SY-DYNNR
                   'PA0001-WERKS'
          CHANGING LTAB_DYNPSELECT-FLDNAME
                   LTAB_DYNPSELECT-FLDINH.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'MANDT'.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'SACHX'.
APPEND LTAB_DYNPSELECT.
PERFORM SHOW_HELP TABLES LTAB_DYNPSELECT
       LTAB_DYNPVALUETAB
USING 'T526'
       'SACHX'
                  CHANGING PA0001-SACHA.
ENDFORM.         " VALUES_SACHA
      FORM VALUES_TRFGR
      Provide popup help for Pay Scale Group
FORM VALUES_TRFGR.
REFRESH: LTAB_DYNPSELECT,
           LTAB_DYNPVALUETAB.
LTAB_DYNPSELECT-FLDNAME = 'MANDT'.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'MOLGA'.
SELECT SINGLE MOLGA FROM T001P
         INTO   LTAB_DYNPSELECT-FLDINH
          WHERE WERKS = *PA0001-WERKS
          AND   BTRTL = *PA0001-BTRTL.
IF SY-SUBRC NE 0.
    LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFAR'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFAR.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFGB'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFGB.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFKZ'.
SELECT SINGLE TRFKZ FROM T503
         INTO LTAB_DYNPSELECT-FLDINH
         WHERE PERSG = *PA0001-PERSG
         AND   PERSK = *PA0001-PERSK.
IF SY-SUBRC NE 0.
    LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFGR'.
LTAB_DYNPSELECT-FLDINH = SPACE.
APPEND LTAB_DYNPSELECT.
PERFORM SHOW_HELP TABLES LTAB_DYNPSELECT
       LTAB_DYNPVALUETAB
USING 'T510'
       'TRFGR'
                  CHANGING PA0008-TRFGR.
PERFORM UPDATE_VALUE_ON_SCREEN USING SY-REPID
                   SY-DYNNR
                   'PA0008-TRFGR'
                   PA0008-TRFGR.
ENDFORM.         " VALUES_TRFGR
     FORM VALUES_TRFST
      Provide popup help for Pay Scale Area
FORM VALUES_TRFST.
REFRESH: LTAB_DYNPSELECT,
           LTAB_DYNPVALUETAB.
LTAB_DYNPSELECT-FLDNAME = 'MANDT'.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'MOLGA'.
SELECT SINGLE MOLGA FROM T001P
         INTO   LTAB_DYNPSELECT-FLDINH
          WHERE WERKS = *PA0001-WERKS
          AND   BTRTL = *PA0001-BTRTL.
IF SY-SUBRC NE 0.
    LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFAR'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFAR.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFGB'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFGB.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFKZ'.
SELECT SINGLE TRFKZ FROM T503
         INTO LTAB_DYNPSELECT-FLDINH
         WHERE PERSG = *PA0001-PERSG
         AND   PERSK = *PA0001-PERSK.
IF SY-SUBRC NE 0.
    LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
PERFORM READ_VALUE_FROM_SCREEN USING SY-REPID
                   SY-DYNNR
                   'PA0008-TRFGR'
          CHANGING LTAB_DYNPSELECT-FLDNAME
                   LTAB_DYNPSELECT-FLDINH.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFST'.
LTAB_DYNPSELECT-FLDINH = SPACE.
APPEND LTAB_DYNPSELECT.
PERFORM SHOW_HELP TABLES LTAB_DYNPSELECT
       LTAB_DYNPVALUETAB
USING 'T510'
       'TRFST'
                  CHANGING PA0008-TRFST.
PERFORM UPDATE_VALUE_ON_SCREEN USING SY-REPID
                   SY-DYNNR
                   'PA0008-TRFST'
                   PA0008-TRFST.
ENDFORM.                 " VALUES_TRFST
      FORM SHOW_HELP        *
--> FTAB_DYNPSELECT       *
--> FTAB_DYNPVALUETAB     *
--> FSTR_HELP_INFO        *
--> F_NEWVALUE            *
FORM SHOW_HELP TABLES FTAB_DYNPSELECT   STRUCTURE DSELC
FTAB_DYNPVALUETAB STRUCTURE DVAL
               USING F_CHECKTABLE      LIKE HELP_INFO-CHECKTABLE
F_CHECKFIELD      LIKE HELP_INFO-CHECKFIELD
             CHANGING F_NEWVALUE.
DATA: LSTR_HELP_INFO LIKE HELP_INFO.
DATA: LC_SELECTION_VALUE LIKE HELP_INFO-FLDVALUE.
DATA: LC_SELECTION(1)    TYPE C.
*-- Fill in fields required for help function call
LSTR_HELP_INFO-CALL       = 'T'.
LSTR_HELP_INFO-OBJECT     = 'F'.
LSTR_HELP_INFO-SPRAS      = SY-LANGU.
LSTR_HELP_INFO-CHECKTABLE = F_CHECKTABLE.
LSTR_HELP_INFO-CHECKFIELD = F_CHECKFIELD.
CALL FUNCTION 'HELP_START'
       EXPORTING
            HELP_INFOS   = LSTR_HELP_INFO
       IMPORTING
            SELECTION    = LC_SELECTION
            SELECT_VALUE = LC_SELECTION_VALUE
       TABLES
            DYNPSELECT   = FTAB_DYNPSELECT
            DYNPVALUETAB = FTAB_DYNPVALUETAB
       EXCEPTIONS
            OTHERS       = 1.
IF LC_SELECTION NE SPACE AND SY-SUBRC = 0.
    F_NEWVALUE = LC_SELECTION_VALUE.
ENDIF.
ENDFORM.           " SHOW_HELP
      FORM READ_VALUE_FROM_SCREEN               *
--> F_REPID               *
--> F_DYNNR               *
--> VALUE(F_FIELDNAME_IN) *
--> F_FIELDNAME_OUT       *
--> F_FIELDVALUE          *
FORM READ_VALUE_FROM_SCREEN USING F_REPID
              F_DYNNR
              VALUE(F_FIELDNAME_IN)
     CHANGING F_FIELDNAME_OUT
              F_FIELDVALUE.
DATA: LTAB_FIELDS LIKE DYNPREAD OCCURS 0 WITH HEADER LINE.
DATA: LC_DYNAME LIKE SY-REPID.
DATA: LC_DYNUMB LIKE SY-DYNNR.
DATA: LC_DUMMY(1) TYPE C.
*-- Read the screen to see if the user has entered a value for WERKS
LTAB_FIELDS-FIELDNAME = F_FIELDNAME_IN.
append ltab_fields.
LC_DYNAME = F_REPID.
LC_DYNUMB = F_DYNNR.
CALL FUNCTION 'DYNP_VALUES_READ'
       EXPORTING
            DYNAME     = LC_DYNAME
            DYNUMB     = LC_DYNUMB
       TABLES
            dynpfields = ltab_fields
       EXCEPTIONS
            OTHERS     = 01.
read table ltab_fields index 1.
*-- Return the value from the screen
IF SY-SUBRC EQ 0.
    SPLIT LTAB_FIELDS-FIELDNAME AT '-'
          INTO LC_DUMMY
          F_FIELDNAME_OUT.
    F_FIELDVALUE = LTAB_FIELDS-FIELDVALUE.
ENDIF.
ENDFORM.           " READ_VALUE_FROM_SCREEN
      FORM UPDATE_VALUE_ON_SCREEN               *
      The PROCESS ON VALUE-REQUEST does not always return blanks.   *
      If a blank value is to be returned, this routine must be      *
      called.
--> F_REPID               *
--> F_DYNNR               *
--> VALUE(F_FIELDNAME)    *
--> F_FIELDVALUE          *
FORM UPDATE_VALUE_ON_SCREEN USING F_REPID F_DYNNR VALUE(F_FIELDNAME) F_FIELDVALUE.
DATA: LTAB_FIELDS LIKE DYNPREAD OCCURS 0 WITH HEADER LINE.
DATA: LC_DYNAME LIKE SY-REPID.
DATA: LC_DYNUMB LIKE SY-DYNNR.
LC_DYNAME = SY-REPID.
LC_DYNUMB = SY-DYNNR.
LTAB_FIELDS-FIELDNAME = F_FIELDNAME.
LTAB_FIELDS-FIELDVALUE = F_FIELDVALUE.
APPEND LTAB_FIELDS.
CALL FUNCTION 'DYNP_VALUES_UPDATE'
EXPORTING DYNAME = LC_DYNAME
          DYNUMB = LC_DYNUMB
TABLES DYNPFIELDS = LTAB_FIELDS
EXCEPTIONS OTHERS = 8.
ENDFORM. " UPDATE_VALUE_ON_SCREEN
regards
vinod

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The report region returns a single row of data from a SQL select. One of the fields returned is a user id (which I translate into a user name using a LOV).
In the form region, I have a select list containing users (based on the same LOV as above). The form is used to add a new record to a table. I want the select list in the form region to display the same user as displayed in the reports region. I'm adding in the form is based on the user id in the report region.
How do I do this? Because the form region is adding a new record, and uses the Database field as Source, it always displays the first item in the LOV.
I tried using computations to override what's in the select list in the form region (by doing a SQL select and getting the same row of data as in the reports region) but this doesn't seem to work. The select list just always defaults to the first user.
Is there a trick for making one select list match another?

Cheers - think you're right, using the default will do it. Having a bit of trouble with my SQL select now though...
This is the SQL I'm was using
SELECT ASSIGNED_USER_ID FROM REQUEST WHERE REQUEST_ID = 1;
How do I rewrite this as a PL/SQL function or expression to return the ASSIGNED_USER_ID field as my default (I'm still learning the basics of PL/SQL)?

Making a field mandatory based on values in a drop down

Hi,
I am new to Javascripting on the Adobe Designer and we have a requirement to make a text field mandatory based on one of the values selected in a drop down list on the same form.
When I say mandatory I mean we need to prevent the form from being Saved if this text field is not filled - specifically when a value (say "Promotion") is selected on a drop down.
Please help me with the events under which the script needs to be placed and the scripting commands.
Thank you!
Neera

Hi,
You can put PPR event on EMAIL field. Catch that event in PFR and put your logic there like:
if EMAIL is not null then make FORMAT field mandatory (for that u can catch that in PR)
--Sushant

Select field 'B' based on field 'A'

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