Hi Idris,
you can use the method SET_ZERO in CL_SALV_COLUMN_TABLE class
DATA: GR_COLUMNS TYPE REF TO CL_SALV_COLUMNS_TABLE.DATA: GR_COLUMN TYPE REF TO CL_SALV_COLUMN_TABLE.
GR_COLUMN ?= GR_COLUMNS->GET_COLUMN( 'MENGE' ).
CALL METHOD GR_COLUMN->SET_ZERO
EXPORTING
VALUE = ABAP_FALSE.
.