@Lukas W. thanks for the pointer but sadly still no joy. Have added/tried all the combinations I can think of - user_id on it's own, username on it's own, and both as below but still the same error and the same error log. Can you see what I'm missing/getting wrong here?
Header...
Hi am running into the internal error below, even though I am specifying the username parameter: https://screencast-o-matic.com/screenshots/u/hh9M/1575889079384-12707.png . User is a superuser, posting to /api/resources/ to create a new resource. Other API calls set up and working; e.g. get...