Reserves should not be allowed to be locked when the interval is > smallest interval in use
Reserves are locked based on gate_closure and update_frequency. If the interval length at the time of locking is larger than in the 'real time' solve then all time periods will not have locked variables. Hence, this should not be allowed. (Another option would be to copy variable fixed values from the time period that presents non-locked time periods, but this is probably a marginal use case and not worthwhile)