To reduce a wage type's amount by 10%, you must multiply the current amount by 0.90. The operation AMT 0.90 correctly performs this calculation. The requirement to "retain it for further processing" means the modified wage type must be placed back into the Input Table (IT) so it can be processed again by subsequent operations or rules within the same schema loop. The operation ADDWTI (Add Wage Type to Input table) achieves this. Therefore, the combination AMT 0.90 ADDWTI is the correct sequence of operations.

A. AMT 0.90 ADDWT: This is incorrect because AMT 0.90 sets the amount to a fixed value of 0.90, it does not multiply. ADDWT sends the wage type to the Output Table (OT), not retaining it in the Input Table (IT).

C. AMT 0.10 ADDWT: This is incorrect as AMT 0.10 sets the amount to 0.10. Furthermore, ADDWT sends the wage type to the Output Table (OT), which does not meet the retention requirement.

D. AMT 0.10 ADDWTI: While ADDWTI correctly retains the wage type in the Input Table (IT), the operation AMT 0.10 incorrectly sets the amount to a fixed value of 0.10 instead of performing the required percentage reduction.

1. SAP Help Portal - Payroll Operations Documentation: The official documentation for SAP ERP Human Capital Management outlines the functions of personnel calculation rule operations.

Operation AMT: The documentation specifies that AMTK multiplies the amount field by a constant. To reduce by 10%

the multiplication factor is 0.90. (Reference: SAP ERP Central Component -> Human Resources -> Payroll -> Payroll -> Tools -> Personnel Calculation Schemas -> Operations -> AMT).

Operation ADDWTI: The documentation states that this operation adds the current wage type to the internal Input Table (IT)

making it available for further processing within the current sub-schema. (Reference: SAP ERP Central Component -> Human Resources -> Payroll -> Payroll -> Tools -> Personnel Calculation Schemas -> Operations -> A -> ADDWTE/ADDWTI/ADDWT).