I have the supply chain matrix set up for site to site.  Works great until I have site A do an internal purchase direct with a supplier of Site B to CUSTOMER 1.  
At the supply site (site , the order is processed to Site A and utilizes the route and transit times even though the ship to address is to CUSTOMER 1.  
The ship via will be the same, (it is going on our own fleet).  

Any thoughts on how to not use the supply chain matrix for site when these orders are processed?