public TaskResourceRep hostVcenterUnassign(URI hostId,URI eventId){
  return hostClusterChange(hostId,NullColumnValueGetter.getNullURI(),NullColumnValueGetter.getNullURI(),true,eventId);
}

public TaskResourceRep hostVcenterUnassign ( URI hostId , URI eventId ) { return hostClusterChange ( hostId , NullColumnValueGetter . getNullURI ( ) , NullColumnValueGetter . getNullURI ( ) , true , eventId ) ; }
unassign host from a vcenter note : in order to maintain backwards compatibility , do not change the signature of this method .
