12.1.3 Imported invoices ignore changed AutoAccounting Rules

We are on 12.1.3. Our AutoAccounting Rules were setup many years back. The Receivables and Revenue Accounts were all derived from the Transaction Type. We have a legacy billing system from where we import invoices into Oracle AR.

Our changing business rules requires us to derive (going forward) the Receivables Account from the Customer Bill-To Site instead of Transaction Type. The Revenue Account derivation will remain unchanged (from Transaction Type).

In a TEST instance, we have changed our AutoAccounting for just the Receivables Account to "Site". We have populated our customers' Bill To Sites with the Receivables Account in AR.

We created manual invoices directly in AR and see that the invoices show the Receivables Account from the Site. So accounting on the manual invoices is correct.