HI marlonnz,
The Item ID field is essentially your own assigned identification number for a specific item created in your inventory. It's used for all internal tracking and inventory management purposes. The Supplier Item ID is the unique identifying code assigned by your supplier for the same item. You can enter the Supplier Item ID in the Buying details section of items.
Currently, you can't use different item numbers directly for sales orders and purchase orders at the time of creation. However, the Supplier Item ID will be displayed under the Item ID column when viewing, printing, or emailing the bill or purchase order in PDF format.
Cheers,
Princess
