Payroll Processing Class - PCR

Dear experts,

I have (04) Wage Type 1111, 2222, 3333, 4444 with

Custom PC 91 with 1

How to cumulate the amount stored in above (04 wagetypes) to WT 1234

I wrote as below but didn't work

ZL01 Personnel Calculation Rule  ZL01

    *

      ****

        VWTCL 91   Processing class

          *

            ERROR      Cancel processing

          1

            ADDWT *    OT   Output table

            ADDWT 1234 OT   Output table