RM3192 | Manually issued payable order: What to check
From HM Revenue & Customs · Repayment Claims Manual
Before you pass the repayment to the typist you must check the R23 to satisfy yourself that
the box for Income Tax and Tax Credit contains a tick
the name and address boxes are clear and unambiguous
the unused boxes in amount, supplement and total have been struck through
the repayment has been authorised by an RE