The Time Characteristic Info Object 0caimonth is in Inactive mode

The Time Characteristic info object 0calmonth is in inactive version. I tried to activate it through business content but still in inactive version and found the below errors in Log.

Operation SDOK_M_ATTR_CREATE could not be carried out for

Characteristic 0CALMONTH: Error when creating document property

Error when activating InfoObject 0CALMONTH

Characteristic 0CALMONTH: Error when generating master data routines

Operation SDOK_M_ATTR_CREATE could not be carried out for

Characteristic 0CALMONTH: Error when creating document property

Error when resetting InfoObject 0CALMONTH to the active version

Can anyone know about this error.

Thanx in Advance.