The RequestedDeliveryGuarantee parameter with DataType BrokerTransportQualityOfService specifies the delivery guarantees that shall apply to all NetworkMessages published by the WriterGroup unless otherwise specified on the DataSetWriter transport settings. The DataType BrokerTransportQualityOfService is defined in

The value NotSpecified is not allowed on the WriterGroup. If the selected delivery guarantee cannot be applied, the WriterGroup shall set the state to Error.