We had cross-posted in a thread that was created in 2011. But this new thread will be the "right" place to discuss. Main thing is to compare the standard Intercompany sale process with your process, there are similarity.
Genalyn,
Your requirement seems similar to how SAP standard behaves in intercompany sale process. Therefore look at standard process.
The pricing procedures are different from regular sale and intercompany sale. Here the statistical value in the sales order can be converted into non-statistical in the intercompany billing document.
RVA001
ICAA01
SAP SD Exclusive Study Materials: INTER-COMPANY SALES PROCESS (CONFIGURATION)
TW