Business area field in Cost center

Dear Guru's

We created a Cost center for a validity period of 01.01.2006 to 31.12.9999 with a business area of ABC.

Transactions and line items are existed in the cost center

Now we decided to change the business area of the cost center from the ABC TO XYZ. I went to KS02 here the filed is editable mode when i enter the new business area for cost center it gives a message in the following manner.

Field change Business Area is not possible (transaction data already exists)

Message no. KS134

please could you help me how to change the field.

Thanks and Regards