Hi Heather,
That's a screen shot from a VERY old version of Purchase Orders for Adagio. You are on Upgrade Plans and have the current version available.
Perhaps it is time to ask you Adagio Consultant to drop by and get your modules current? You'll notice a large number of improvements in PO processing and much greater stability in the product.
It's possible your data is damaged - does it pass the Data Integrity Check?
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Andrew Bates