anchor.diff:  reserved_unit4(_RSU, Acc) ->
   	Acc.
   
  --spec initial_service_rating_b(MSCC, ServiceContextId, ServiceInformation,
  -		Destination) -> ServiceRating
  +-spec initial_service_rating(MSCC, ServiceContextId, ServiceInformation,
  +		Destination, Class) -> ServiceRating
   	when
   		MSCC :: [#'3gpp_ro_Multiple-Services-Credit-Control'{}],
   		ServiceContextId :: string(),
   		ServiceInformation :: [tuple()],
   		Destination :: string() | undefined,
  +		Class :: a | b,
   		ServiceRating :: [{struct, [tuple()]}].
   %% Create list of service elements to be rated.
  -initial_service_rating_b(MSCC, ServiceContextId, ServiceInformation, undefined) ->
  +initial_service_rating(MSCC, ServiceContextId, ServiceInformation, undefined, Class) ->
   	SCID = {"serviceContextId", ServiceContextId},
  -	initial_service_rating_b1(MSCC, SCID, ServiceInformation, undefined, []);
  -initial_service_rating_b(MSCC, ServiceContextId, ServiceInformation, Destination) ->
  +	initial_service_rating(MSCC, SCID, ServiceInformation, undefined, Class, []);
  +initial_service_rating(MSCC, ServiceContextId, ServiceInformation, Destination, Class) ->
   	SCID = {"serviceContextId", ServiceContextId},
   	Des = {"destinationId", {array, [{struct, [{"destinationIdType", "DN"},
   			{"destinationIdData", Destination}]}]}},
  -	initial_service_rating_b1(MSCC, SCID, ServiceInformation, Des, []).
  -%% @hidden
  -initial_service_rating_b1([#'3gpp_ro_Multiple-Services-Credit-Control'{
  +	initial_service_rating(MSCC, SCID, ServiceInformation, Des, Class, []).
  +%% @hidden
  +initial_service_rating([#'3gpp_ro_Multiple-Services-Credit-Control'{
   		'Requested-Service-Unit' = RSU, 'Service-Identifier' = SI,
  -		'Rating-Group' = RG} = _MSCC | T], SCID, SInfo, Des, Acc) ->
  +		'Rating-Group' = RG} = _MSCC | T], SCID, SInfo, Des, Class, Acc) ->
   	Acc1 = case SI of
   		[] ->
   			[];
  
positive.code: 		_ ->
  			[Des | Acc3]
  	end,
  	ServiceRating = case reserved_unit(RSU) of
  		[] ->
  			{struct, [SCID, {"requestSubType", "RESERVE"} | Acc4]};
  		ReservedUnits ->
  			{struct, [SCID, {"requestedUnit", {struct, ReservedUnits}},
  					{"requestSubType", "RESERVE"} | Acc4]}
  	end,
  	initial_service_rating_b1(T, SCID, SInfo, Des, [ServiceRating | Acc]);
  initial_service_rating_b1([], _SCID, _SI, _Des, Acc) ->
  	Acc.
  
  -spec update_service_rating_b(MSCC, ServiceContextId, ServiceInformation) -> ServiceRating
  
negative.code: post_request_scur(SubscriberIds, SvcContextId,
  		SessionId, MSCC, Location, initial, a) ->
  	Path = get_option(nrf_uri) ++ ?BASE_URI,
  	ServiceRating = initial_service_rating(MSCC, binary_to_list(SvcContextId),
  			Location, undefined, a),
  	post_request_scur1(SubscriberIds, SessionId, ServiceRating, Path);
  post_request_scur(SubscriberIds, SvcContextId,
  		SessionId, MSCC, Location, initial, b) ->
  	Path = get_option(nrf_uri) ++ ?BASE_URI,
  	ServiceRating = initial_service_rating(MSCC, binary_to_list(SvcContextId),
  			Location, undefined, b),
  	post_request_scur1(SubscriberIds, SessionId, ServiceRating, Path);
  post_request_scur(SubscriberIds, SvcContextId,
  		SessionId, MSCC, Location, interim, a) ->
  