Few days and I'll deliver the application and it's including a reports, you can't test reports till you have a real data, and client can provide these after delivery, so I want to know how to tell the client the support task for the application nicely including reports because sometimes clients ask for a change as support.

Myself and customer agreed on a support period after delivery, for the application testing is done and for reports also is done, but this test performed with demo data not actual live data (Application is Time Attendance system which need to be configured as customer's clients) so how to tell the customer nicely that any issue in UAT is within the report delivery and after fixing issues captured in UAT is support.

I'm asking this becasue I've a payment after deliver the reports itself, so how to declare the issues captured in UAT and issues captured after UAT.