MRP Purchase Order create does not show the Purchase Order Number

When we create a Purchase Order from the MRP Order Recommendation we get a message that says

"1 new purchase order was created"

I would like to change the message to include the Purchase Order number since we have several buyers creating PO's from the recommendations at the same time. This way they can make a note of the PO number. Yes, I know I can make a query that lists the PO's by buyer (already done) but they want to see the number on the message.

I looked into using SBO_SP_TransactionNotification but that only allows you to create an error message, not a success message. (if it can please let me know how!)

Any ideas/suggestions greatly appricated.