certification required from the vendor

While procurement certain items require that the supplier sends a certification along with the shipment of that product.

Currently user needs to remember to request the certification when they send the PO to the vendor. this is difficult, when there is an order for 100 lines, and 4 of those lines need a cert, they forget to ask.

Is there a way to automatically add a comment that says “certification Required” on the lines of the PO for these specific items based on some sort of master data?

It seems logs functionality us for job cost orders only, please advise any alternative