How to make a field manadatory within ALV Grid using methods and classes

Question

Hi,
I am using ALV Grid using set_table_for_first_display
inside my dialog programming. I have a field called project number inside my grid which has to be made as mandatory field.
I have defined a method called catch_data_changed inside my class lcl_event_receiver. This method captures the changes made to one of the fields inside my ALV grid and displays all the default values of the other fields from the grid.
Now, i have to make project number which is one of my fields inside my ALV grid as mandatory. At the field catalog level i did not find any such option for making a field as required field.
Is there any other way, i can accomplish this within the ALV grid?

Answer 1

from my understanding from ur question, i understood that u want the editable field inside alvgrid to be mandatory.
i dont know anthing in fieldcat, but u can try the following logic.
FORM DATA_CHANGED  USING P_ER_DATA_CHANGED TYPE REF TO
CL_ALV_CHANGED_DATA_PROTOCOL .
  DATA: L_VALUE TYPE LVC_VALUE,
    ls_mod_cell type lvc_s_modi.
  READ TABLE P_ER_DATA_CHANGED->MT_MOD_CELLS INTO LS_MOD_CELL.
if sy-subrc = 0.
    CALL METHOD P_ER_DATA_CHANGED->GET_CELL_VALUE
      EXPORTING
        I_ROW_ID    = LS_MOD_CELL-row_id
        I_FIELDNAME = LS_MOD_CELL-fieldname
      IMPORTING
        E_VALUE     = L_VALUE.
IF LS_MOD_CELL-FIELDNAME <> 'fieldname what u want'
MESSAGE 'ENTER VALUE INTO (fieldname u want) ' TYPE 'I'.
ENDIF.
ELSE.
MESSAGE 'ENTER VALUE INTO (fieldname u want) ' TYPE 'I'.
ENDIF.