Dan...
Do you have a Procurement process (a P2P platform)?
If so, I'd pull the Vendor and their products out of the system/catalogue.
Or are you asking from a Venminder perspective?
I think our configurations are likely unique, but you might make a note in the Vendor Profile that they are not to be used.
Not sure that solves for your problem.
I look at Venminder as the system in the middle; black listed vendors shouldn't make to Venminder...
Your Procurement and Sourcing solution are likely the best place to maintain a black list.
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Bradley Martin
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