The unique purchase order group identifier. Mandatory.
The purchase order group is a sequential identifier that might be generated by the application (group appears after the entry has been saved), entered by the user, or both, depending on the application setup (this is controlled by a system parameter).
A purchase order group is a set of new purchase orders, purchase order adjustments or purchase order cancellations that have not been updated. When all purchase orders in the group have been approved and updated, the group is deleted and the identifier can be re-used.
Valid range is 0 to 9999.