Deprecate an object (term) with workflow
You may not simply delete an object. Instead, you must move it through the defined workflow process until it is Deprecated. The process is basically identical to the publication process, except that one marks the object (term) for deprecation by setting the Workflow Deprecation Requested under Attributes of the object (term) to “True” when editing the Draft.
Information note
When deprecating a term, all child terms must first be deprecated.