Material used at the pool

When a technician records what went into the water, that amount leaves the vehicle's stock. Nobody books it separately.

Good to know

Which place it comes off is a chain, and it is deliberate:

1. the vehicle assigned to this route — the exception, for a van in the workshop,
2. otherwise the technician's default vehicle,
3. otherwise the team's default vehicle,
4. otherwise the default warehouse.

A decommissioned vehicle is still used. That looks wrong and is right: the goods are where they are. Falling back to the warehouse would deduct at a place they never were — exactly the silent error the book exists to prevent. That a retired van is still on routes shows up at the next count.

A shortfall is booked, not refused. If the technician enters 200 g and the van holds 150 on paper, it is booked. The stock goes to minus 50, and that is the information: less was loaded than was used.

Until 17 August 2026 there was a GREATEST(0, …) in the visit route — the shortfall was quietly clamped to zero and nobody found out. A technician at a pool must never be blocked because the bookkeeping is off. But the business has to see it.

Without a stock location nothing is booked. The consumption is still recorded on the visit; it just does not come off anything.

What it does not do

It does not check plausibility. Two hundred grams into a 30,000-litre pool is booked as typed.

It does not distinguish spillage from dosing. What was entered as used is treated as used.