Payroll Cumulation error

Hello gurus,

I need help with the below please:

Holiday allowance - Employee A - 200

                             Employee B - 320

                             Employee C - 500

Now when I run payroll for these 3 employees, for some reason the system does the below at the point of cumulation

ADDCU     P30 - Employee A - 200

                         Employee B - 520

                         Employee C - 1020

Basically what it is doing is adding the previous employee's amount to the current employee's amount and giving that as this person cumulation.

Processing class in V_512W_D is set to T for my wagetypes. I am using cumulation type M for my wage types.

I have checked and re-checked all tables and can't find an explanation.

Can anyone help with this please, I am stumped.

Thanks much