How to update old records of LIPS used user exit MV50AFZ1

To All Experts,
I have used User Exit MV50AFZ1 and in this user exit i updated the fields
USEREXIT_MOVE_FIELD_TO_LIPS.
LIPS-ETENR = VBEP-ETENR.
Its working fine for new VL0N1 t-code, but what about old recods of LIPS table ?
How to update old records ? Pl. guide me.
Yusuf
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Reply

Hi Yusuf,
See SAP Note 415716 - User exits in delivery processing, it explain how these userexits work and cautions that you must have.
Regards
Eduardo