Expense Charge Account Rules for POs Created via Import Standard Purchase Orders process

We are creating Standard Purchase Orders via the Import Standard Purchase Order process.

For several item categories, we have Expense Charge Account Rules setup.

However, when we import the POs, the POs are not reflecting the charge account rules; rather, they are being assigned the charge account associated with the employee record for the buyer.

If we create a PO directly in the PO form in Oracle, the Expense Charge Account Rules setup "trump" the charge account of the buyer, as expected.

Any suggestions on how the expense charge account rules setups can be incorporated into our process so that they will be reflected in the PO charge account.