Bottle stores and taverns carry shrinkage and compliance pressures most retailers never face. High-value, easily-walked stock and strict end-of-day reconciliation leave little room for a loose system.
The fix is tight tracking and tight controls: inventory counted to the single unit or measure, age-restricted product handling at the till, and a locked-down cash-up that has to balance before the day can close. That combination protects both your margin and your licence.