Hi Sam,
As Dan has stated, there are issues with Event Tracking in PO's. We created the PO product as Purchase Orders for Adagio and could not get the Event Tracker to work properly with GL budgets.

The issue was specific to crossing over fiscal years. To be clear, we did the product design and we will not use PO Event Tracking for any of our clients.

We have a solution that we have installed for encumbrance accounting, that can do either soft or hard encumbrance accounting, that considers the PO module integrated with FX and Gridview and is quite a solution.

Best,
Brian