Validity date Change for Cost Element

Hi,

The cost element validity period from 01.01.2014 to 31.12.2014 Now i want to extend this cost element validity period.

And when i extend the validity period from 01.01.2014 to 31.12.2015 i am facing this error like " New analysis period must not exceed maximum period limit"

Please help me to fix this error and find the error screen for reference.

Regards,

Babu