Linking a Purchase order to a Sales order

​Sometimes a Purchase Order is created specifically for a Sales Order. Often known as a back to back order.
Process:

1. To link a Purchase Order specifically to a Sales Order Item  enter sales order number in “Sales Order Item” cell, like so: 

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1. System will show all product codes on that specific Sales Order
2. Select Sales Order-product code from a dropdown list as  shown on picture above