how to grey out fileds in customer master

Hi All,

I need to grey the telephone2 field in customer master.

I tried to implement the enhancement point CUSTOMER_FIELDSTATUS , but it is marked as 'Can only be implemented SAp internally'

I have read many threads on sdn, they all explain about implementing enhancement point, but i need very specific information regarding CUSTOMER_FIELDSTATUS or if the issue can be resolved through any other method.

Regards