The primary vendor's item number, not your item number, is set up to print on item purchases

MYOB AccountEdge item purchases are currently set up so your vendors' item numbers appear on the purchases you print using AccountEdge. If you use a different system of numbering your items than your vendor, this might seem confusing to you when you first print your purchases. If you wish to change the way your item purchases print-in other words, if you want to print your own item numbers on the purchases-you'll need to customize the item purchase form.