Deleting Cost Center Validity Period

Dear Experts,

I have a cost center A with validity period 01.01.2013 to 31.12.9999 its already transaction posted to the cost center, recently by mistake I add new validity period 01.01.2013 to 28.01.2013. How do I roll back/delete this Validity period of 01.01.2013 to 28.01.2013?

Kindly suggest any possible solution.

Thanks in advance!

Warm Regards,

Aulia Rasyidi