[rules-users] ClassCastException in ruleflow

Hi, I have a real annoying problem with my ruleflow, when I execute a subprocess, I get a classcastexception on my variable communication. Apparently Drools thinks the variable is an instance of the class masterproef.common.Patient, while my variable is of the type masterproef.humancommunication.Communication... I really don't know how this happened. All my settings appear to be correct. Any ideas? Thx,