problem in updating LIPS table in outbound delivery user exit

Hi,

I wrote a code in outbound delivery user exit (save document userexit) to update LIPS table.

for example

XLIPS-LGORT = '0657'.

XLIPS-PIMNG = I_LIPS-LFMING

(PICKing QUANTITY = DELIVERY QUANTITY)

MODIFY XLIPS TRANSPORTING LGORT PIMNG.

After outbound delivery created i couldn't found my entries in lips table. it shows me as blank.

Can anybody tell me what went wrong?

Thanks and Regards,

Suresh.