Edit IF_OS_CA_SERVICE~SAVE of generated class cb_

Hi All,

I have to edit the IF_OS_CA_SERVICE~SAVE method in CB_<> class which is the generated class of persistence class.

When i am editing this method i am getting a message saying the

"Co-classes of persistent classes cannot be edited directly"

Any idea how to edit this method and make some changes in the code ?

Thanks,
Abhishek