I've a database with an Image field at contact level.
If I do a GET of a contact, change something and do a PUT again, I get this message:
Invalid Custom Field: does not accept the value 'System.Drawing.Bitmap'
Of course it doesn't. But it gives that as output in the GET response:
so it gets it back in a PUT request.
I think Image fields should be ignored on PUT/PATCH if there's only 'System.Drawing.Bitmap' in it ?