Hello. I want to hear the opinion of the community and offer a separate HTTP code for the situation when the client has sent data that on the side of business logic is processed with an error. An example in the context of the REST. 1) If the client did not pass a required key or syntax error, then the HTTP 400 response. It's okay. 2) If the client passed the key and value, further data processing led to an error when the entity cannot be created/modified for reasons at the application logic level. For this case, I propose to make a new HTTP code.
