When trying to post a payment to a supplier through the payments to suppliers option in the purchases menu, the open invoice is displayed, and the correct amount of the payment is entered into the transaction when I press the 'ALL' option (selects the outstanding unallocated amount).  However when I come to enter the transaction the system returns the error message "At least one transaction is overallocated".  I believe there is a work around by posting through the bank and general ledger accounting menu but I think this first approach to supplier payment should work too.  Is this right?  Im using FA 2.2.9