Hi Surya,
I think you have not enhanced your view . ( Also check context node class whether is enhanced or not ) .
Generally Standard throws this error when view is not enhanced and when user is trying to make some changes at context node level.
--> you need to enhance component first. Later view . Then you need to enhance the context node ( CN000 ) level .
Then it will allow custom changes as context node class turns into ZCLASS
Hope i am right and this will help
Regards,
Dinesh Gurram