Hi Susan,

1=PO. 2=Receipt. 4=Invoice/Adjustment. These are the important ones.
3=Return, which is legacy and Adagio PurchaseOrders does not use.

If you are ever interested in what Document Type values are, in GridView when a Doc Type field is included in a view, you can right-click on column title and choose Field Properties. If a 'lookup table' has been created for this field, then the list of possible values and what they mean will be displayed here. Also, these lookup values are automatically used in your inquiry if you enable the option to 'Translate coded fields' in the View Definition. So the column would show 'PO' instead of simply '1'.