Change Settlement rule: After Settlement

Dear Experts.

I have a long run maintenance order which is already settled to a Cost Center.

Now I want to settle the debit value of the order to different cost center from this month onwards.

Although i change the settlement rule as below

When i execute the KO88, Still my receiver is previous Cost center.

What is the change the change should I do?

Thanks fro the Advice

Ashok M