If the user has the right to view balances when opening a delivery note, then in a delivery note of any type for each line of goods, the goods balance will be displayed in UOMs from the delivery note for the department from the document's header BEFORE saving the current document.
In the delivery note, the value in the Balance field is accumulated for several lines with the same goods. And as a result, the "calculated balance" for consumables of delivery notes can have a negative value. When writing off a quantity greater than the balance, the “negative quantity” will be automatically compensated by the system when saving an active delivery note.