Ship-On-Behalf-Of and VAT

I'm in the process of trying to set up the Ship On Behalf OF (SOBO) functionality.  I have used this capability before at other companies.  To be clear, this is the process where an OM Business Unit that rolls up to one GL BU sources product from an IN Business Unit that rolls up to another GL BU.  We've not had any difficulty on the setup to get the basic SOBO functionality working.  We've done all of the core setup such as defining the Inventory Transaction Rules, the Distribution Networks, the Transfer Pricing.  We can execute the SOBO transaction and