On a product's Stock history page, Record a stock change shows its reasons as choices. Stock received also takes the cost per item and the supplier's Invoice or delivery note number. Other asks What happened, and the change is not recorded without it. The stock history shows the number or what happened with the change.
Stock changes ask what happened when the reason is Other
Recording a stock change shows its reasons as choices. Stock received takes the supplier's invoice or delivery note number, and Other asks what happened.