Pulp

pulp_core: 3.14.5
pulp_container: 2.7.1

In RHUI workflow we support pre-syncing the content and then making it available (say at GA) with by simply repointing the distribution. This works correctly in pulp_rpm, but pulp_container raises an error when a REST request is issued to update a distribution. Given this distribution:

{
    "base_path": "base_path",
    "content_guard": "/pulp/api/v3/contentguards/container/content_redirect/5fbef8f9-cfce-4bca-a376-c46403fcafc5/",
    "description": null,
    "name": "name",
    "namespace": "/pulp/api/v3/pulp_container/namespaces/2c0429a6-faf4-46fd-9cbe-c441da1ac5e9/",
    "private": false,
    "pulp_created": "2021-09-22T14:18:23.653633Z",
    "pulp_href": "/pulp/api/v3/distributions/container/container/3a8537e8-6e16-498c-bea2-ee4837bcf768/",
    "pulp_labels": {},
    "registry_path": "localhost:24817/base_path",
    "repository": null,
    "repository_version": "/pulp/api/v3/repositories/container/container/cadd407b-411c-4597-9b2a-ab278a480dca/versions/1/"
}

Now, I want to change this distribution to always point to the latest repository version instead of a fixed one, so I'm trying to populate the repository field:

curl -u admin:****** -X PUT -H 'Content-type: application/json' -d '{"name": "name", "base_path": "base_path", "repository": "/pulp/api/v3/repositories/container/container/cadd407b-411c-4597-9b2a-ab278a480dca/"}'  http://localhost:24817/pulp/api/v3/distributions/container/container/3a8537e8-6e16-498c-bea2-ee4837bcf768/

{"non_field_errors":["Only one of the attributes 'repository' and 'repository_version' may be used simultaneously."]}[

It doesn't make a difference if I supply "repository_version": null in the request body, or when using PATCH HTTP method.