To void a bill, we have to unsettle settlement from HO then sync HO > sync POS > Void Bill > Settle > Sync POS.
As per our present architecture, HO user & POS users are in separate group. Even if we provide bill void access rights to HO user, the user will not be able to access POS; hence would not be able to void. That is why from HO, one can only view POS bills / PTC bills.
We're marking this idea as unlikely to implement. We appreciate your effort; Keep posting.