Cash Equivalent System Pay Code for BIK corrections

It would be useful if the system had a CASH Equivalent system paycode. This is required as throughout a tax year, we have had to complete manual corrections, as the system cannot perform retrospective BIK calculations, when notified in arrears of vehicle changes. We have created a manual paycode to deal with the corrections, but this does not feed into the P11D information at the end of the year and this has caused discrepancies with the reporting and EXB generation.