System.out.printIn("EXPRESSION START");
wt.fc.Persistable pbo = (wt.fc.Persistable )primaryBusinessObject;
if(pbo instanceof wt.part.WTPart){
wt.part.WTPart part = (wt.part.WTPart)pbo;
part.setPartType(wt.part.PartType.toPartType(PartType));
wt.fc.PersistenceServerHelper.manager.update(part);
}else{
System.out.printIn("PBO is not instance of Part: Do nothing in workflow expression")'
}