When you click the Process button, a message box will appear asking if you want to convert the Purchase Order to a Purchase Receipt. If you choose 'Yes' a new Purchase Receipt will be created with all the same data as the Purchase Order and a message will appear informing you when the process is complete. The message box will also display the new Purchase Receipt number and ask if you want to view the new Purchase Receipt. Click 'Yes' to close the current vendor purchase order and open the new Purchase Receipt or 'No' to remain on the current purchase order.
Once the new Purchase Receipt has been created the original Purchase Order will be stamped Completed and you will not be able to alter the information for that Purchase Order. This prevents it from inadvertently being changed after it has been invoiced. You will still be able to select most of the fields in the purchase order form but you will not be able to change any of the data.