[rules-users] qualified identifiers in constraints: not commutative?

I notice an unexpected behavior when creating a technical DRL in Guvnor. If I have a fact with a sub-fact, then binary operators don't seem to be commutative. Eg., declare Broker maxQ: Integer declare Order q: Integer b: Broker The rule $o:Order($o.b.maxQ < $o.q) validates fine, but $o:Order($o.q > $o.b.maxQ) returns an error "Unable to create restriction '[QualifiedIndentifierRestr: > $o.broker.maxQ ]' for field '$o.q' in the rule" I'm new, so I want to make sure I'm not missing something obvious here...