Set Parameter ID not working for custom screen

Question

I am trying to call a custom screen when a user clicks on a hotspot in an ALV grid (reuse_alv_grid_display). I want specific values from the row that has been selected by the user to be displayed in the fields of the custom screen.

form handle_user_command using r_ucomm     like sy-ucomm
                               rs_selfield type slis_selfield.

  CASE r_ucomm.
    when '&IC1'.

      if rs_selfield-fieldname = 'SEL'.

        READ TABLE it_zcnclog into wa_zcnclog INDEX rs_selfield-tabindex.
        SET PARAMETER ID 'MAT' FIELD wa_zcnclog-material.
        Call SCREEN '1001'.

If I replace the custom transaction with a standard SAP transaction then values are shown on the standard transaction's screen but otherwise it doesn't. I have checked the SET/GET parameter checkboxes and also checked the TPARA table for the entries but no luck.

Thanks for the help.

Answer 1

The custom transaction that you're calling needs the MEMORY ID value set in the parameter declaration.

PARAMETER: matnr type mara-matnr MEMORY ID MAT.

If the transaction you are calling is a classic dynpro transaction, you need to edit the element attributes of the field and add the MEMORY ID and the SET & GET Parameter boxes.