In ApprovalMax, Purchase Order numbers are not generated by ApprovalMax but assigned by your connected accounting system once a Purchase Order has been fully approved and sent through.
Purchase Order numbers are assigned automatically by Xero when the Purchase Order is fully approved in ApprovalMax and sent to Xero.
The numbers ascend incrementally (e.g. PO-001, PO-002, PO-003, etc.). So, the first Purchase Order you send to Xero will be PO-001 by default.
Important Note: If a Purchase Order is permanently deleted in Xero, Xero will reuse that number the next time a Purchase Order is created. For example:
You create and send Purchase Orders with the numbers PO-046 to PO-049.
You delete PO-047 in Xero.
The next Purchase Order created will be assigned PO-047 again, filling the gap.