By default, the Free Version of SpendMap will automatically assign incrementing PO numbers to each new Purchase Order that you enter in the system.  You can set up your “Next PO number” during the Setup Wizard that runs automatically when you log into your Live System for the first time.

But if you prefer to enter your PO numbers manually for each new order, just select the following menu in SpendMap…
– PURCHASING > Setup system > Incrementing document number sets > POs

Then modify PO Number Set A as follows.  From that point on, whenever you enter a new PO in your PO Work Area, the PO Number will be blank and you can enter it manually for each order.