i have added a new column in the screen 4900 of sales order which corresponds to the field zzitbsez in vbap table . i have added this field in vbap . I wrote code in userexit_move_field_to_vbap to move values
MOVE xVBAP-ZZITBSEQ TO VBAP-ZZITBSEQ. in mv45afzz
But the problem comes when i enter some value in this column in VA01 transaction, the debugger does not even goto this code part.