setDegreeModule(null); setCourseGroup(null); setBeginExecutionPeriod(null); setEndExecutionPeriod(null);
removeDegreeModule(); removeCourseGroup(); removeBeginExecutionPeriod(); removeEndExecutionPeriod();
    public void delete() {        removeCurricularPeriod();        setDegreeModule(null);        setCourseGroup(null);        setBeginExecutionPeriod(null);        setEndExecutionPeriod(null);        super.deleteDomainObject();    }