F4 Help to Get File from AL11 in Selection Screen

To provide F4 value help for files on the application server (AL11), the most effective way is to use specific SAP function modules within your ABAP code. Since standard search help doesn't automatically browse application server directories, you must implement the logic in the AT SELECTION-SCREEN ON VALUE-REQUEST event.

Recommended Function Modules

For browsing and selecting files directly from the application server, you can use these common modules:

• /SAPDMC/LSM_F4_SERVER_FILE: This is widely used to open a pop-up that allows users to navigate the SAP AL11 directories and select a file.
• F4_DXFILENAME_TOPRECURSION: Another standard function module specifically designed for search help on application server files.

Implementation Example

To add this help to a selection screen parameter (e.g., p_file), use the following logic in your report:

abap

PARAMETERS: p_file TYPE string.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
  CALL FUNCTION '/SAPDMC/LSM_F4_SERVER_FILE'
    IMPORTING
      serverfile       = p_file
    EXCEPTIONS
      canceled_by_user = 1
      OTHERS           = 2.

Key Considerations

• Permissions: Ensure the user has the necessary authorizations (e.g., S_DATASET) to access the specific AL11 directory paths.
• Directory-only Help: If you only need to select a directory (not a specific file), you can call the program RSWATCH0 or use F4IF_INT_TABLE_VALUE_REQUEST after fetching directory lists via EPS_GET_DIRECTORY_LISTING.
• Presentation Server Difference: For files on your local PC (Presentation Server), use CL_GUI_FRONTEND_SERVICES=>FILE_OPEN_DIALOG instead