RM3304 | How to prepare and issue a payable order: Payable order duplicate
From HM Revenue & Customs · Repayment Claims Manual
When the payable order is typed you must
note on the form R30 that the payable orders have been handed to the Issuing Officer `except for PO number……. which is to be issued by hand’
hand the duplicate to the Issuing Officer for posting to FAO (Payments) in the normal way
keep the payable order under lock and key until it is called for.