Goods already paid for to the supplier but with no buyer yet: what is on the shelf and how much money is frozen in it.

Such goods appear on their own: the buyer backed out of an order, but you had already paid the supplier; or a deal was cancelled, the item came back, and nobody refunded the supplier’s money. Before, this money was visible nowhere — it is rightly absent from the profit report (it is an asset, not an expense), and it left the cash desk long ago.
Stock answers two questions in one line: what exactly we have and how much money is in it. Such goods are sold by an ordinary deal with the “goods from stock” mark — then the purchase is not written off from the cash desk a second time, and the cost is recognised by the deal that sold them.
The state of an item is not stored as a tick but calculated from the facts: sold — it left the shelf, the buyer returned it — it is back, sent back to the supplier — it is closed. There are no forgotten marks here.
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