Not bale to find BPA while adding line items to my order

Summary: I am creating a manual PO and want to add a new line assocaited to an existing BPA. When I try to find the BPA it does not exist. Then If I change the buyer from the PO and put the same of the BPA, the BPA # apperars. Is that correct? The BPA buyer needs to be the same as PO buyer if I want to assocaite manually a PO line with a BPA line?

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