Is Oracle able to match a manual invoice to an existing Contract?

Summary:

A customer wants to do self billing, thus he wants to send us the invoices created by him and we would simply need to import them into our AR. But what happens with the billing status on the contract in regards to this customer? Is there any way we can update the billed amount on the financial summary tab of the contracts?

Content (required):

Currently we are trying to find a workaround solution on how to map self billing invoices (received from one of our customers). The customer sends us the invoices and we upload them into AR, but these have no impact on the billed amount in contracts. Is there any way we can flow the information from AR to Contract Management for this scenario?