Technically, ACAS ranges aren't really relevant to legal seperation are they? I mean, why should ATC care (other than as a courtesy) about exactly when some instrument in your cockpit starts bleating? All they need care about is whether the traffic satisfied the requirement of being 'seperated'. If that can be proven to be true, then ACAS warnings are no more than nuisance, but not proof of transgression, and thus there isn't a situation that needs 'fixing' (other than maybe taking a little more time to note who's flying where, and maybe asking ATC about them). Flying into Lanseria presents the same problem. SA has to be built up in a very proactive manner when in the FALA TMA/CTR, so WHEN you get the 'Traffic, Traffic!', you know what it's referring to at least.