Fully Paid Invoices on "Accounts Payable Trial Balance"

Hi,

We are on R12.1.3, and have an SR open for this issue, but I wanted to ask for other people's advice too on this issue.

This year, in 2019, we suddenly started getting a big increase in the number of invoices appearing in the output of the "Accounts Payable Trial Balance" report (APTBRPT), which have a "Payment Status" of "Fully Paid", but the "Original Amount" and "Remaining Amounts" are the same.

This is an example:

We have tried many things to resolve this, such as rebuilding the TB report, etc. etc.

The strange thing is that sometimes, an invoice will appear on the TB output with this issue, e.g. this happened to an invoice created on 4th Jan 2019. We have the output from the TB ran on 15th March 2019, and the invoices has this issue.