Thanks for the programme. an answer please

How is it possible to stop negative selling? It means if the product balance is 0 or less than the quantity sold, a warning will be given. Not being sold

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A low or negative stock warning is currently an idea for improvement. See this topic:

However, I don’t think stopping the sale will be implemented since it would hurt back-order invoicing, which is legally required in some countries.

The meaning of your question is not clear, @Mina. If you are asking how selling of items showing negative quantities on hand can be stopped, @Ealfardan has answered you. If you are asking how you can prevent items from becoming negative in the first place, you must purchase more of the item before selling it.