We work of contracts where our payment terms are identified and typically run based on a milestone of delivery dates, etc. 

We are currently using staged billing.  The problem we are running into is as follows:

Order is created, staged billing created, order is released.

We go to build (CTO) and config changes or our qty was wrong.

Right now, we are not able to make changes that do not effect prices.  We have to close the order line manually and create a new line on the order.  

We would really like a better solution for this.  Any ideas welcome.