How to set the reading order of the objects to assign cost center?

Hi Experts!

In my company I used the object A (work center) to group a center cost because in a same O (organizational unit) we have a lot center costs. But when I run the payroll, the program search the center cost (object K) in this order:

1) P - person

2) S - position

3) O - organizational unit

How can I change this order for this?

1) P - person

2) S - position

3) A - work center

4) O - organizational unit

OBS: The object A is attached in object S.

Sorry my English.

Best regards.

Helio Rabello