Attaches a dictionary attribute definition to the category with no values selected yet. Values are selected
with POST /catalogs/nodes/{id}/attributes/{attributeDefinitionId}/dictionary/values, which attaches the
attribute itself when it is missing - so this call is only needed when the attribute should be in place
before any value is chosen. Handles dictionary definitions only and fails when the category already has this
definition as a CLA. An attribute inherited from a parent
category does not count as assigned here, so the call succeeds and creates an assignment on this category
that overrides the inherited one.

The attribute is stored on the category immediately, while adding it to products runs as a background task. That
task covers the products in this category; the products in its sub-categories are reached only once propagation
is switched on for this attribute, which is off on a newly created CLA - switch it on, as well as mandatory,
with PATCH /catalogs/nodes/{id}/attributes/{attributeDefinitionId}. The task ID is returned in the
Resource-Id response header and Location points at GET /async/status/{taskId}, which reports whether the
propagation has finished.

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