At present, there isn't an automated feature in KashFlow to copy the PO number to Purchase by default. It will copy only the PO Reference field value automatically after getting converted into Purchase.
However, this does seem like a good idea though so it would be great if you could add your suggestion to our KashFlow Canvass website where KashFlow clients can share ideas directly with our Product team.
At present, there isn't an automated feature in KashFlow to copy the PO number to Purchase by default. It will copy only the PO Reference field value automatically after getting converted into Purchase.
However, this does seem like a good idea though so it would be great if you could add your suggestion to our KashFlow Canvass website where KashFlow clients can share ideas directly with our Product team.