UC_OBJECTS_NOT_NUMLIKE Error when DELETE

I have encountered this problem when trying to delete.

Ive found the solution on the net.
Here you go:
      loop at tt_mbewa2.
        if tt_mbewa2-lfgja NE v_ersda(4) OR
           tt_mbewa2-lfmon NE v_ersda+4(2).
          DELETE tt_mbewa2.
        endif.
      endloop.