Problems creating dynamic selection screen

Question

Hi all,
i'm trying to dynamically generate a selection screen and show it as subscreen using the two function modules FREE_SELECTIONS_INIT and FREE_SELECTIONS_DIALOG. I call the function modules in the PBO of the therefor defined subscreen. The FREE_SELECTIONS_DIALOG fm has the two import parameter "as_subscreen" and "as_window". If i use the "as_window" parameter the selection screen comes up as popup. If i use the "as_subscreen" parameter, i can't see anything in my defined subscreen.
Any suggestions ?
Thanks in Advance
Dirk

Answer 1

Hi,
The above requirement is not possible without using logical database.
The reason is that the compiler identifies the below syntax only inside a LDB program .
SELECTION-SCREEN DYNAMIC SELECTIONS
                 FOR {NODE|TABLE} node [ID id].
The above syntax creates a subscreen container on the standard selection screen of the program during generation
and we are able to view the dynamic selections icon on the selection screen.
Hence it is not possible to use the FM 'FREE_SELECTIONS_DIALOG' as a subscreen without using a
logical database of the relevant table.
However if you dont want to create a new LDB for each table, there is a trick which needs to be performed
once in your SAP system and all custom programs can use this FM to create a dynamic selection screen
as a subscreen of the standard selection screen.
The prerequisite steps are as follows:
1: Create a dummy  / test database table in SE11 with a single field i.e. for example mandt , matnr
2: Create a new logical database program for this table in SE36. Save and activate.
This will create dynamic selections for the fields of the table created in step 1.
Steps to be followed in the required custom ABAP program to create the dynamic selection screen as a subscreen.
A: Include the LDB program created in step 2, in the attributes of the custom ABAP program.
Now when you execute the program, you can see the dynamic selection icon for the dummy table created in step 1.
B: In your custom program we need to suppress the icon for 'Dynamic Selections' from the standard selection screen.
   We need to perform this action, because the 'Dynamic Selections' icon always triggers a call to the
   dynamic selection screen of the included LDB progam. ( In our case a dummy table created in step 1 ).
   Whereas we want to trigger a call of the dynamic selection screen of our desired table.
   Logic is as follows:
   In 'AT SELECTION-SCREEN OUTPUT' event call the FM RS_SET_SELSCREEN_STATUS to exclude the fcode 'DYNS'.
C: Add a pushbutton / checkbox on your selection screen to trigger a call to the FM 'FREE_SELECTIONS_INIT' &
   'FREE_SELECTIONS_DIALOG' in the 'AT SELECTION-SCREEN' event.
D: When the user clicks the pushbutton / checkbox for dynamic selections call the above 2 FM for the desired table
    with the AS_SUBSCREEN flag of FREE_SELECTIONS_DIALOG = 'X'
Result: Your dynamic selections screen will be created as a subscreen of the standard selection screen and not as a pop-up.
Advantage: With the creation of the single custom table & LDB, you are now able to create dynamic selections as subscreen
in any program in the system. All we need to do is follow the steps A, B & C in each program.
Note: Your other restrictions with dynamic selection screen ie. submit in background , save as variant still remain and
you need to handle them accordingly.
let me know if you need sample code.
Regards,
Bhawit Kumar