I tested this and I see the problem.
If you have a PO for £1,000 at 20% tax then the toal value is £1,200 but the prepayment amount can only by a maximum of £1,000.
I tested this and I see the problem.
If you have a PO for £1,000 at 20% tax then the toal value is £1,200 but the prepayment amount can only by a maximum of £1,000.