I want my POS can not sell when the qty is already out of stock.
I already set up in product page, set stop selling when out of stock. But still the transaction still go on even the stock is zero.
And I got the negative stock.
how to set POS cannot create order when stock is already OOS ?
Do you mean you can still create orders with those out-of-stock products?
Then hiding those products from the sell-screen might be a solution. When a product is out of stock, you cannot find them.