Unable to reverse transfer to Subledger Accounting-Payroll Process Parameter Blank

Summary:

We have a production issue where multiple payrolls for January 2027 across three different payrolls were processed in the wrong payroll year with process date of 31 Jan 26. We now need to reverse the Transfer to Subledger Accounting, but when attempting to submit the Reverse Transfer to Subledger Accounting process, the Payroll Process parameter shows no values, even though it is required. Because of this, we cannot proceed with reversing SLA, and we are unable to roll back payroll processes (up to Calculate Payroll) to correct the processed payroll.

Could someone please advise the supported steps to reverse SLA when the Payroll Process parameter is blank? Guidance on how to unlock or proceed safely would be greatly appreciated.