Invoice Instalment amount is different from actual Payable Amount

Summary:

Invoice is underpaid but still system has marked it as fully paid invoice.

Content (please ensure you mask any confidential information):

Hi,

There is an invoice where WHT is applicable. In this case, invoice line amount + tax amounts are equal to 250,161 and WHT is 2161, so ideally amount payable should have been 248000 whereas in our case, payment was created for amount 247,957 and the invoice got marked as fully paid. This balance is reflecting as open balance in Aging report and we are not able to even pay this variance of 43. Amount is immaterial but we cannot have the balance hanging in aging report forever.