Maintenance Cycle in Chaneg Management

Hi,

For the Change management,in maintenace cycle,when i try to Activate the Status (Status -> Activate),i am getting the following messages

'Phase change from 'Created' to 'Development without Release' is not possible'

MsgType Message Class Msg.no. Message text

E /TMWFLOW/PHCNTRL 54 Change transaction is incorrect

E /TMWFLOW/PHCNTRL 56 Phase transition from 'Created' to

'Development without Release' is not possible

What could be the reason.

Regards,

Cherry