I believe that is what I have done. The sample project I’ve linked for my other question (https://forums.servicestack.net/t/parameters-cannot-have-both-a-in-body-and-in-formdata-as-formdata–will–be-the-body/6505?u=nic65535) regarding OpenAPI also demonstrates this problem. I’m sure that both issues are related to the way I have constructed and/or annotated the DTOs but I can’t figure out how.