changes in the user exit for VL01N dont reflect..

Hello all,

I need a user-exit for restricting display ( and ultimately the delivery )of line-items while creating outbound delivery doc , depending on whether a particular line item is approved or not. I am currently using the user-exit (function exit)-exit_saplv50p_001 -> enhancement V50PSTAT. but the changes made to the work area is_lips in the include dont reflect in the final delivery 'item data' table . Is there any other way I can delete the unapproved line item form the final item-data table? The tables that are used in the main VL01N transaction are FXLIPS,XLIPS,L_LIPS etc. Please help me out here.

Regards,

me.