3.1.5 Message Processing Events and Sequencing Rules

The client SHOULD ignore errors that the RPC server returns and notify the application invoker of the error received in the higher layer. The client SHOULD ignore values that the RPC server returns that are not described or that are described as reserved for future use, as specified in section 2, and the client SHOULD notify the application invoker of invalid values in the higher layer. Otherwise, no special message processing is required on the client beyond the processing required in the underlying RPC protocol.<22>