The WC1 API does not support case creation with Name Transposition through the API.
However, if a case is created through the WC1 Application with Name Transposition turned ON, then the API will continue to use Name Transposition when screening the case. So Name Transposition is a case creation screening type selection, and case creation with Name Transposition selected through the API is not available yet.
If you are using postman collection,then using SEQ-4a(screening request) you can able to screen a case means screening a request.For this request you have to update the case-system-id for that particular case, for which you want to send the request via environment variable.Once you screen the case successfully,it will appear WC1 API also.
Hope this will help .