When paying fines in 3.10.x it shows what was paid for if you pay for an item (something with a barcode). But if you pay for a line that you entered manually without an item it does not say what you paid for. For example: I created a manual invoice for Copier fees and then clicked 'Pay' on the line for the Copier fees and it recorded that as just 'Payment Thanks' instead of 'Payment Thanks - Copier Fees'
*** This bug has been marked as a duplicate of bug 2696 ***