Changing Customer on a Project

I've a client who setup a project in Project Controller under one customer ID. After sending out two invoices, they change the customer id. and billed another invoice. All three of these invoices had retention amounts. Since the third invoice completed the project, they billed the entire retention amount on the project to the second customer ID. 

When they run the Project Aging report (PA110.rpt) now, the invoices for the second customer ID show up, even though the project is complete and those invoices paid. My assumption is that this is related to the change in customer ID.

Does anyone have any suggestions on how to clear this up? 

Thanks in advance!