Removes the assignment from this category only: the attribute definition itself is untouched, products keep the
values already propagated to them, and subcategories stop inheriting the attribute. An attribute inherited from
a parent category cannot be removed here - call this on the category it is assigned on, which
GET /catalogs/nodes/{id}/attributes reports as assignedOn. Nothing is propagated, and the call also
succeeds when the category has no such attribute; it fails only when the attribute definition itself does not
exist.

For more detailed information on how to work with Category Level Attributes in Bluestone PIM, refer to our help
pages Category Level Attributes (CLA).