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You cannot unapprove a purchase order if it is attached to a vendor invoice unless the vendor invoice has been voided.
You cannot change a purchase order status from Approved to Preliminary if a change order is attached to the purchase order.
Concepts
About Purchase Orders
Tasks
Turning on purchase orders
Setting up Manage menu security
Setting up reports security
Designing Purchase Order Task Widgets
Creating Reporting Purchase Order Widgets
Creating a purchase order
Adding optional columns in the Purchase Order Manage menu task
Editing a purchase order
Approving a purchase order
Copy a purchase order
Voiding a purchase order
Closing a purchase order
Reopening a closed purchase order
Creating a change order
Printing purchase order
Purchase Orders
Assigning roles and employees to tabs
References
Purchase Order Base
Purchase Order Detail Base