The WS-C 1.1. spec employs a slightly different set of SOAP fault codes to the 1.0 implementation. The current 1.1. implementation is still generating faults included in the 1.0 set but not in the 1.1 set, for example, NO_ACTIVITY. This may lead to interopability issues. All fault cases should be checked and, where necessary, corrected to generate faults which conform to the specification.