Maintenance parts inventory
A count that is added up from what moved, not typed over.
Two boxes of the wrong filter and none of the right one is the usual state of a store cupboard. This keeps the list and the movements: received, used, and the correction after somebody actually counts. The number on the shelf is added up, never typed over.
A shelf list and a movement log. It does not raise purchase orders, does not order anything and does not talk to a supplier — a reorder level here puts a part on a list and nothing else.
Nothing on the list for this building yet. Add the things you run out of — filters, belts, lamps.