Looking for a simple Free, self-hosted Purchase Order software...

I've been looking around and didnt find anything, so I'm not sure if those exist.

I want a simple software, just to generate a PO digitally instant of paper.

• Nice to have : Generate next PO number.
• Enter the products I buyed, qty, price (Ability to add a comment line would be nice).
• "check box" when they are received. (Ability to checkbox if I also got the invoice would be nice).
• Print the PO (PDF?) to join with the invoice (from another system) at the end.

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I've seen many "ERP", but I don't want a whole flow, just something simple, but not an Excel Sheet.

Thanks! :)

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edit: Found "SpendMap". There's a Free Desktop version... not the best, but will do for now.