Making dynamic selections field required

Question

I need to define one dynamic selection field as required.

I created a transaction code with a starting variant.

For this variant in the attributes screen assignment, there is no "required field" option on dynamic selections, only "protect field".

Any idea how to implement this?

Answer 1

On variant attributes screen assignment there is not required field option on dynamic selections

There is Required attribute in screen variant and it is perfectly usable for making regular field mandatory, and in dynamic selections too.

If you lack it, check your release or maybe your installation is corrupted. I don't believe it is tcode-dependent.

Answer 2

If you are talking about the Dynamic Selections, then you can only protect the fields. Example with demo program DEMO_LIST_OUTPUT (which is based on the F1S Logical Database):

You can only protect those fields against input, and all other attributes are deactivated (they are not implemented as you can see in subroutine MODIFY_SCREEN of program SAPLSSEL).

The only possible workaround to simulate a mandatory field is to implement ABAP code after the user has entered selections (or not). For instance, in the program DEMO_LIST_OUTPUT, you may add this ABAP code which checks that the screen field "Connection Number" contains a value when the user executes the program:

TABLES sscrfields.
AT SELECTION-SCREEN.
  DATA dynsel TYPE rsds_trange.
  CALL FUNCTION 'RS_REFRESH_FROM_DYNAMICAL_SEL'
    EXPORTING
      curr_report        = sy-repid
      mode_write_or_move = 'W'
    IMPORTING
      p_trange           = dynsel
    EXCEPTIONS
      not_found          = 1
      wrong_type         = 2.
  DATA(connid) = VALUE spfli-connid(
    dynsel[ tablename = 'SPFLI'
        ]-frange_t[ fieldname = 'CONNID'
            ]-selopt_t[ 1 ]-low OPTIONAL ).
  IF sscrfields-ucomm = 'ONLI' AND connid IS INITIAL.
    MESSAGE 'Flight Connection number is required' TYPE 'E'.
  ENDIF.

NB: Tested with ABAP 7.52. Dynamic Selections can be implemented implicitly via Logical Databases (which are obsolete since ABAP 7.02 or 7.31) or explicitly by calling the function modules FREE_SELECTIONS_INIT and FREE_SELECTIONS_DIALOG.