SSP item validation based on supplier part number

Summary:

Is there a validation that can be built or does it exists in SSP Smart form when the requester is trying to create a non catalog item (description only/special handling) but the item already exists.

In our system, the Supplier part number is mandatory while creating a Smart form based requisition. The users mostly enter a valid supplier part number here. Sometimes when they cannot find an item, they create a non catalog/decription only item requisition. Can a validation be built to check for the item existence either at the Org level or global level based on the supplier part number entered? If the supplier part number matches, then a notification/pop up to the user calling out that the item exists in item master and not to create a non catalog requisition? Anyone else have