Help on GI for fully interchangeable MPN-MRP sets

Hi Experts,

SAP help says On entering goods issue for a reservation, you can partially or fully replace an inventory-managed manufacturer part, which was originally reserved for the order, with interchangeable manufacturer parts, and post them to the reservation without changing the order. I am not able to find  "choose MPN Selection on the selection screen for reservation items" in MIGO screen. Any help will be highly appreciated. Other functionalities like stock overview, stock requirements list and MRP run is working fine for MPN-MRP sets. We are testing in ECC 5 DIMP system.

SAP help: http://help.sap.com/saphelp_di471/helpdata/EN/f6/4d83ecd30e11d2b40f006094b9c9be/content.htm?frameset=/en/74/b86764d08811d2b4d2006094b9c9be/frameset.htm

Goods Issue

Create a goods issue with reference to a reservation.

Before copying the required reservation items, choose MPN Selection on the selection screen for reservation items. A screen appears showing all of the parts that are fully interchangeable with the originally reserved part. The system uses different colored traffic lights to show whether the interchangeable parts belong to potentially different MPN-MRP sets. The system also displays the MRP area (if active) and storage location.

Select items, add the quantity, and copy them to the overview screen for goods issue.

Thanks

Rijil