I have been trying to do some research into when or if NS really plans to address this issue. There are a couple of threads from about 2007-2010 with what seem like great strides to resolve the problem of authorizing back orders at their original Sales Order total, but here we are in 2014 and it doesn't look like it there is anything that NS has rolled out for this.

We get regular calls from customer's that are upset that we have held several hundred or thousands of dollars on their account for say $150 worth of back ordered items that are ready to ship out. We like so many users have tried to explain to our customers, that it is a system issue outside of our control, but we have been put in the position several where we have to closed the order and void the authorization instead of having the opportunity to completely fulfill the order and add to our Sales.