newRtn.assertLeftTuple( rtnLeftTuple, rtnLeftTuple.getPropagationContext(), wm );
}
} else if ( newRtn != null) {
// old does not exist, new exists, so insert
rtnLeftTuple = newRtn.createLeftTuple( leftTuple,
newRtn,
tupleMemoryEnabled );
leftTuple.setObject( rtnLeftTuple );
newRtn.assertLeftTuple( rtnLeftTuple, rtnLeftTuple.getPropagationContext(), wm );