This is cause by the unit of purchase, unit of issue and conversion rates settings for the stock item.
For example, a stock item has a Unit of Purchase of dozen (12), a Unit of Issue of ea (1), and a Conversion Factor has been set that 1 dozen = 12 ea. The Purchase Order is used to purchase 4 units of the item, the Goods Receiving, receives 4 units, the new quantity on hand will be the old quantity on hand plus 48, i.e. 4 x unit of purchase x conversion to unit of issue, i.e. 4 x 1 x 12 = 48.
Article ID: 16, Created On: 7/9/2010, Modified: 7/9/2010