Update on purchase price

Hi,

I’m trying to select « Last Purchase Price » for the cost type. Although I get this popup saying « missing stock unit or purchase unit ». What exactly am I missing? I put in a PO and went through that. The field « Last Purchase Price » has an updated number as well. Is it just general popup that isn’t an error?

I found the option to enable « Manage purchases unit on products » in the purchase app configuration. It seems to avoid the whole conversion issue