I am running on the latest package version, in the api_client.py, line 229, the code is looking up a type mapping based on a status code. As it can not resolve it, it falls back toNone, overwriting the actual response. A hotfix is to change line 348 insources_api.py to:'201': "CreateSource..."

As the code is auto-generated, I assume that the underlying API documentation needs to be updated. I have attached screenshots for reference.