Signature required for delivery

Hello again,

I've had another interesting question come up and wanted to see how others handle it.

We have some locations that we want to require a signature be obtained when UPS, FEDEX- who ever delivers.

Do folks handle this through the system in some manner, perhaps a comment on the Purchase Order (that may be ignored or not passed on from the supplier to UPS) or work with the delivering organization?

Thanks,
Wendy