How to enable AR invoice inbound in CMK?

Oracle has the predefined inbound message definitions for AP invoice, but for AR invoice, there is only outbound message definitions no inbound.

Our client has this requirement: In Poland, all the AR invoices should be validated and issued by KSeF system, so we are trying to configure the CMK to exchange the xml invoice. We are able to send out the AR invoice, however, how to update the KSeF number back to the AR transaction (a DFF is used to capture the number)? We cannot find a message definition can be used to update the Fusion AR transaction.

Can anyone help?