Eclipse customer purchase order (P/O) number are free-form entries. However, if you need a set of specific purchase order numbers, such as on pre-printed P/Os, you can add valid P/O numbers by customer. This means, if a customer arrives with a pre-printed form and the purchase order number is not entered as a valid number, then the number cannot be used.
To add a valid P/O number:
From the Maintenance menu, select Customer and display the customer record you want to add purchase order formats to.
From the Additional menu, select P/O Validation to display the Customer PO Format Validation Layout window.
Click the Valid P/O Numbers tab.
From the File menu, select Insert.
On each new line, add the numbers you want to use as valid P/O numbers in the correct format.
These numbers become the selection list in the Sales Order Entry Order Summary pane:
Save your changes and exit the window.