JDE retrieves tax code from header branch instead of using detail branch

We use intercompany order processing and customer by line of business. Company A will enter a sales order (header branch will be company A) and stock will be taken from branch B at detail line. When user goes in to amend the sales line weight info, upon clicking save button, JDE will default the DETAIL branch's customer record of tax into the sales order, instead of using the header branch company A.
So the order now ends up with the wrong tax code. The order belongs to company A but system keeps populating company B's tax code (from customer master setup by company