This part changed in AX2012, because filters are used instead of ranges (see a bit more about them here).
You can get filter values by this code:
Query q = InventSum_ds.queryRun().query();
QueryFilter qf;
int i;
for (i = 1; i <= q.queryFilterCount(); i++)
{
qf = q.queryFilter(i);
info(strFmt("%1: %2", qf.field(), qf.value()));
}