Problems importing POs using the PO_DOCS_OPEN_INTERFACE

We recently upgraded from 12.1.3 to 12.2.9. We are now seeing some POs that fail validation after PDOI runs. We import from an outside purchasing system into the interface tables and then run Import Standard Purchase Orders. Some are approved and some are rejected. The error for the rejected ones is: "Error: Charge Account (Value = 0) is not a valid charge account.". I have validated that the charge_account_id field is being populated and in some cases POs with the exact value in that filed pass and some fail. To make it even more confusing, the POs import successfully in