How to delete attachment entity for a category

Summary:

Hi All,

I need to remove to_buyer, and other categories from Requisition Line Level, however the Delete button is greyed out.

Also I can only see "Manage Attachment Category by Product Management" and not the individual "Manage Attachment Category" is this because of missing Role/Previlige?

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Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):