Changing Branches for Business Documents 
If you are assigned to more than one active branch, one of the following situations occurs when you change the branch in the header area of a business document:
Note
You can change the branch only before you add the document.
Document created from scratch: You can make the change but must use master data assigned to the new branch.
Document duplicated from another document: You can make the change but must use master data assigned to the new branch.
Document copied from other documents: You can make the change only when the base documents are the following:
Sales and purchasing quotations
Sales and purchasing orders that are fully open
Deliveries of non-inventory items
Sales and purchasing document with down payments: You cannot change the branch.
You cannot transfer inventory between different branches or between warehouses that are assigned to different branches. For example, when creating receipts from production based on production orders, you can select only those production orders that were created for the same branch.
For more information, see Creating Business Documents for Branches