MRP Substitute Items

Hello all,

I'm new to ASCP and my client is using 12.2.5,

As far as I know, without any customization, once MRP generates a Requisition it writes it with an Approved status into the Requisition’s interface tables.

How does MRP handles substitute items?

For example: MRP creates a Purchase Requisition with status Approved, for 1 unit of item X, then the buyer convert it into a PO.

The buyer then changes the item in the PO from X to Y, and item X and Y are substitute items (defined at the Item Master level).

My question is, will the MRP generate another Requisition for item X (since item Y was actually ordered), even though the substitute item was ordered eventually?