The operations in a wsdl:binding in a DESCRIPTION MUST result in wire signatures that are different from one another. An ...

The operations in a wsdl:binding in a DESCRIPTION MUST result in wire signatures that are different from one another. An endpoint that supports multiple operations must unambiguously identify the operation being invoked based on the input message that it receives. This is only possible if all the operations specified in the wsdl:binding associated with an endpoint have a unique wire signature.