RM5192 | Over-repayments: Clearance of over-repayments Register entries by RSO
From HM Revenue & Customs · Repayment Claims Manual
It is important that the Register of over-repayments is kept up to date and in particular that
when the over-repayment is not refunded prompt action is taken to notify the officer responsible for following up the matter with the taxpayer
that action is taken to ensure that entries in the Register are cleared at the earliest opportunity.
Failure to take action at the appropriate time may cause the loss of money that should be refunded.