With MDM Workbench 9.0.x, you may find that web service deployment classes are not generated for data extensions. This causes runtime errors when invoking web services affected by data extensions, typically a class not found error referring to a class name with suffix _Ser, _Deser, or _Helper. Classes with these names should be generated when you run Prepare for Deployment on WSEJB projects. If these classes are not generated, the web service won't work.
To resolve this error, right-click on PartyWSEJB (you need to repeat... [More]