Display Substitute item on Work Order and restrict User to enter only Substitute item, not any item

Summary:

Display Substitute item on Work Order and restrict User to enter only Substitute item, not any item

Content (required):

If primary component quantity is in shortage and there exist a substitute item in Item structure (BOM), then there should a restriction or validation, so that User enters only the Substitute item (which exist in Item structure) in the Work Order operation . User should not enter any other item as component in Work Order operation, incase user enters any other item (other than the substitute item), system should display an error message or warning message that item entered is not a substitute item.