How do I address the following error on a Solicitation Response: “A response was previously submitted for this Vendor's TIN (A3596)”?

This Solicitation Response error:

is the result of selecting the "Restrict Multiple Responses per Vendor TIN" (optional) entry on a Solicitation, then creating two or more Solicitation Responses using Vendors that share a TIN (Tax Identification Number).

The only way to address this error once a Solicitation with this selected has closed is to coordinate an override with the CORE Help Desk. The proactive way to address the problem is to not select the “Restrict Multiple Responses per Vendor TIN” checkbox on your Solicitation before publishing it.