AP Invoice Purchase Code functionality

In Company configuration / Modules / AP there is a checkbox “AP Invoice Purchase Code” . This checkbox Specifies the AP invoice system will enable the AP Invoice Purchase Code field for European Financial postings, when this check box is selected. (Help File Text).
We have activated the checkbox, created the Purchase Codes, linked them to GL Codes, Created PO’s, PO Receipts and AP invoices. Regular PO receipt and AP transactions were created based on Part Class and AP GL codes. No transactions were created based on the Purchase Code GL codes. Should we modify posting rules to trigger this transaction?
Thanks for replying.

E10.1.500.10