Hi
In CA02, select you Reference operation line and goto EXTRAS ---> REFERENCE ---> UNLOCK.
This will disconnect the link b/w the reference operation used in particular routing and the master reference operation set which you created in CA11.
Make the necessary changes to Reference operation set in CA02 and save.
Now the master reference operation remains same and changes were made only in the specific Routing.
I hope i solved the issue. If Pls reward the points.
Thanks With Regards,
Dinesh.