How to change Deliver to location/Ship to location of a purchase order from MRP

Summary

Unable to change the line level location/deliver to location on PO backing requisition from MRP

Content

Our requirement is to change the deliver to location for few Suppliers on Purchase order. All the PO's are created from planning, as soon as the planned order is released, it defaults deliver to/ship to based on the organization location.When I go to purchase order line level, the location/deliver to field is grayed out.

How can i update the deliver to/Ship to location on purchase order if I need a different location

For eg: Inventory Org A1 , location ABC