orders05 inbound idoc, manual address of ship-to party in idoc getting cleared

Hi experts,

we are getting inbound idoc for sales order where we have different partner functions in idoc, and address for ship-to party(WE) is available(manual). The address adrnr is coming as WE $0001 as it is input manually. But on saving, it is generating adrnr number but the address details like name1, city, postal code etc are coming blank. Any pointers on why this happens ?Have observed that it is calling ADDR_SAVE_INTERN in update task which updates ADRC tables.But is receiving blank NAME1, NAME2, and other fields except ADRNR. Where used list on this FM doesn't show anything. Also any trick to find where it's called from ?

Our system version is s4core - 104.

Regards

Aditya