Hi, I've been trying your fixes for this error, and sadly no success.  I enter the bill.  It appears correctly in the pay bills window.  I pay the bill, the vendor now has zero balance.  However, the invoice has magically reappeared in the pay bills window.  There is no balance owing in the vendor home page, and no balance owing in the AP summary.  There are no credits to apply.

If I tick and untick the bill to apply the payment to in the payment screen, the amount owing somehow doubles.

This has not happened to any other payable invoices.