How to create a supplier category that does not let to create PO

Summary:

I have a requirement to create some supplier categories, like "ATMaaS & PNN | Leases & Rentals" but this category should not be visible while creating requisition or Purchase order or Requisition and purchase orders should not be created with this category.

To achieve this I have though to create rejection rule so once Purchase order is submitted choosing this category, then PO should get auto rejected. Can anyone please guide how we can do this? Or if this is the only solution or some other solution also exist

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