How to activate DFF default value for Receivables invoice coming from project billing

We have a requirement related to the Billing. On the Receivables side we have created a DFF (for invoice header) with a default value. We want to see this default value for all the new invoices coming to Receivables. Unfortunately the invoices coming from project billing are created with no value for this DFF, it is empty. This behavior is caused by the fact that the invoice is going from Projects to Receivables through interface and the specific attribute in the interface is empty, therefore based on the information from the interface invoice in Receivables is created without any value