Back to Back Order with Substitution Items

We have a requirement to receive the Substitute item on the PO, of a corresponding Back to back order and Ship the Substitution item that's received.

1. For item A123, Item Relationship setup is enabled to include the Item A234 and with the type as Substitute and Reciprocal check box is checked.

2. Back to back SO 123 created with item A123. Required purchasing Jobs are run so a corresponding PO is created, PO 123.

3. At this point of time, the item A123 on SO 123 will have a reservation on the PO for the PO Line item A123

4. While receiving against PO123, substitute item