Personalized PO number is not showing in Receipt form LOV for receiving

Dear All

My client is using personalization for generating PO Number. Based on Supplier-Site the PO number is created and stored in segment1 in PO_HEADERS_ALL. The original PO number as per setup in Organization > purchasing option also stored in PO_HEADERS_ALL in different field.

My client used to enter this personalized PO number while receiving. It was working in 11i and Client just upgraded to 12.2.4 and now we are not able to get these Personalized PO number in LOV of receipt form. Instead that we are seeing the original PO number as per normal setup done Organization > purchasing option.