In the Purchase Order form you can have a custom message appear on the printed Purchase Order. This is a good way to enter a specific message about the selected Purchase Order like 'Thank You for your order' or 'Call us again soon!'. There will be one of two slightly different buttons displayed on the Purchase Order form depending if a message exists or not.
This button will appear if there are no messages entered for the selected Purchase Order. Clicking this button will open the Purchase Order Message form, which will allow you to enter a message for the selected Purchase Order. When you are done entering a message, click on the X button at the right hand corner to close the form and return to the Purchase Order form.
If this button is showing in place of the normal message button then it means there are existing messages for the current Purchase Order. Clicking this button will open the Purchase Order Message form displaying the previously entered message for the selected Purchase Order. When you are done editing or viewing that message, click on the X button at the right hand corner to close the form and to return to the Purchase Order form.