This functionality is new as of version 4.0.
To View the Purchase Order Log:
Navigate to the ‘Purchase Order Details' screen → ‘Purchase Order Log’ tab.
Captured Events can include:
When the Purchase Order Status changed.
When Deliveries were created, deleted, or stocked.
When Purchase Order Items were cancelled.
When the Unit Cost of a Purchase Order Item was changed.
To add a Comment or Alert, refer to Add Comments & Alerts.