SAP Message RP128 - Ret.acct.period must be after earliest ret.acct.date (&) of payroll per.

Diagnosis The retroactive accounting date may not fall ahead of the earliestretroactive accounting period set for the payroll area. Procedure You can set the retroactive accounting date to the beginning of theearliest retroactive accounting period. If it should be necessary to recalculate a date which falls ahead of theearliest retroactive accounting period, reset the first day of thisperiod.