Stokk keeps two views of your stock, on purpose. Knowing which one you're looking at explains most of the “why does it say that?” moments, so it's worth five minutes.
Every night Stokk reads your real on-hand figures out of your ERP and stores them. Nothing is calculated or guessed: it's a straight copy of what your ERP believed at about 03:00. Think of it as a photograph taken once a day.
During the day Stokk keeps its own running figure. When a picker completes an order, the stock leaves your ERP right then, so Stokk subtracts it right then too. Counts and stock corrections update it the same way. This is the number that answers “what is on that shelf now?”
So yes, the purchasing screen and the picking screen can show different figures for the same item on the same afternoon. That is expected, not a fault.
Two reasons. First, order quantities are built from data your ERP has confirmed, rather than from a running total Stokk maintains itself, so a mistake in the day's bookkeeping can't quietly change what you buy. Second, the suggestion stays put: if you look at an order in the morning and again after lunch, you see the same quantities, instead of numbers drifting as the warehouse picks. You're ordering weeks of cover, so a few hours of movement doesn't change the answer, but it does make the answer harder to trust.
If the overnight read fails, the system health card flags it. Treat order suggestions carefully until it's green again.
A picking screen can show 0 available and a note like “10 staged for other orders”. That means those units are already picked for someone else and sitting on the packing bench. They haven't left the building, so your ERP still counts them, but they aren't yours to take.
The hold clears by itself once that order is invoiced or cancelled. You never have to release it.
On a picking screen, the refresh button next to the scan box re-reads stock straight from your ERP. Select a line first and it checks just that item, which is fast. Use it when the shelf and the screen disagree and you want to know which is right.
If the shelf is genuinely empty when the system says otherwise, say so with Not available. That raises a stock discrepancy for a manager rather than changing stock on the spot.