@Nik It can't be. This is how it goes. Work Order#123 and customer is=John and some items are backorder SO i create PO from that item on line level of work order. SO i select a vendor before saving the PO and make item Receipt. I can't display on Item Receipt saved search the customer name that was been in the WorkOrder

Oh well. I misunderstood. Sorry for that. But if you are creating a PO from SO, then the 'createdfrom' field (standard UI name I think is REF for the field) should have the SO, which in turn will have your Customer. I think you should be able to sort it out this way.