Allow a setup tolerance on prepayments. For example if the order is for $1,000.00 and has a 50% prepayment, a $500.00 prepayment is sent and received. The order is released. The price on the order is changed and sales order is reopened and updated to $1,001.50, and will now not release. Its not reasonable to issue a new prepayment for $.75 for the increase instead the prepayment within a setup tolerance should be kept and the $1.50 added to the final invoice of $501.50.