G'day...
I would highly recommend writing some converter from those positional tags to something useful.
However, your actual problem is most likely twofold:
1) The reading is already mapped. MAP rules by default will not be able to touch readings that have tags starting with @. You can change this with the cmdline flag --prefix, in your case --prefix '&'
2) You have () too many. To refer to the set TOBE, you cannot have (TOBE).
(1 TOBE) asks that the next cohort matches the set TOBE.
(1 (TOBE)) asks that the next cohort matches the tag TOBE.
-- Tino Didriksen
CG-3 Developer