V14 - On Account split payments

We have been attempting to do a split payment using On Account and another kind of payment in a ticketing order. It seems we are unable to use On Account as the first payment if the total payment is higher than the On Account amount. I’ve tried it with a variety of amounts but I get the below message every time.

"The payment amount must be less than or equal to the account credit £### for this customer."

The process works if I select the other payment method first and pay off the remaining balance with on account money – however this seems less practical. As customers are more likely to want to use On Account Money first and then pay off the remaining balance. 

Has anyone else come across this?

Kelly