WSDL defines I/O mep but how is all types of responses handled?

[am am]

Hi,

If a web service defines in the WSDL an operation with input/output message 
exchange pattern (all elements optional for response object type), if the web 
service returns a 202 Accepted, is this handled by the framework silently, or 
an 
exception will be raised? I would expect a null pointer to be returned to the 
calling code. Is this the case?

Thanks!