anchor.diff:  								reason => "Unknown subscriber identifier"}],
   						Problem = error_response(service_not_found, InvalidParams),
   						{error, 404, Problem};
  +					{error, invalid_service_type} ->
  +						InvalidParams = [#{param => "/serviceContextId",
  +								reason => "Invalid Service Type"}],
  +						Problem = error_response(invalid_service_type, InvalidParams),
  +						{error, 400, Problem};
   					{error, Reason} ->
   						{error, Reason}
   				end;
  
positive.code: 	#{cause => "RATING_DATA_REF_UNKNOWN",
  			type => "https://app.swaggerhub.com/apis/SigScale/nrf-rating/1.0.0#/",
  			title => "Request denied because the rating data ref is not recognized",
  			invalidParams => InvalidParams}.
  
  -spec rate(NrfRequest, Flag) -> Result
  
negative.code: 						Problem = error_response(service_not_found, InvalidParams),
  						{error, 404, Problem};
  					{error, invalid_service_type} ->
  						InvalidParams = [#{param => "/serviceContextId",
  								reason => "Invalid Service Type"}],
  						Problem = error_response(invalid_service_type, InvalidParams),
  						{error, 400, Problem};
  					{error, Reason} ->
  						{error, Reason}
  