In one of the final steps of the payroll process, the retroactive accounting of payments of remuneration that, for one reason or another, are no longer consistent with the original payroll run, are carried out. This step is carried out with the help of subschema ERR0.

There are payroll results of previous periods.

Making use of different personnel calculation rules, the subschema ERRO (Retroactivity) carries out the following steps

• Consults whether the process is an original payroll run or a retroactive accounting run.
• Original payroll run: It reads the differences found with the help of the calculation rule X041. This rule adds up the recalculation differences generated by the retroactive accounting of periods prior to the amount to pay of the current period.
• Retroactive accounting run:
• Imports the last payroll result (original payroll run or old retroactive accounting) to the ORT table by means of the calculation rule X048.
• Carries out a loop over the results of previous periods:
• Through the rule E042, it creates the differences and transfers the wage types of the latest payroll results for the retroactive calculation. The wage types already transferred in a previous payroll run cannot be modified later and for this reason should be moved without modification. In addition, according to their class, certain wage types are transferred either to the RT results table or to the difference table DT, or they are added or subtracted to/from the wage types Recalculation difference (/551), Payment amount (/560) or Payments/deductions (/110).
• With the rule X047, it sets the new payment amount (final), that flows to the Payments/deductions wage type (/110).
• Next, the BTFIL function includes in the process the transfers that have occurred in the latest payroll End of the loop.
• The personnel calculation rule X043 differentiates between two cases. In the first case it is assumed that a payment amount was set in an earlier payroll for a retroactive accounting period The new payment amount (/560) is compensated with the amount of the wage type Recalculation difference (/551) (given that, in the majority of cases, the amount of the wage type (/551) is the amount of the original payment). In the second case, it is assumed that the payment amount has not yet been set for a retroactive accounting period in an earlier payroll. In this case, it carries out the same steps as in the first step, but additionally reduces to 0 the amount payable in the internal table Input.

• If the loop has been processed, the calculation rule X043 stores the new payment amount, set by the rule X047, in the differences table (internal table DT).