Hello Softrak,
I would use Plus to delete them if I could but remember that Adagio "breaks" the Plus compatibility to the IC database in some cases and this is one of those.
Assuming it would be safe for the continued use of Adagio, can you tell me how to re-enable Plus on the database ? It would just be to delete the old PO/Receipts and then we could "re-break" it again.