Since BMC has completely changed the call semantics with IIWS version 7.4 this module will not work with previous versions of IIWS. It is possible to use IIWS 7.4 with previous versions of Impact Manager, however.
I have been using a BEM 7.4 installation to test. BMC has changed the WSDL significantly between 7.3 and 7.4. I am working on a version that will work with both flavours... stand by.