Thanks Laxman,
For giving an option which we can study and than implement. Though, we cannot completely remove the approval process as it will be against an ITIL process.
The actual problem which we face is first service request is created for role changes as reported by user, than RFC is created from that SR and than finally a change document is raised for that RFC by change manager. Than the role changes are done in development and moved across the systems.
This looks very lenghty process as this involves multiple team to work on a single RFC.
Is there a possible simplified solution for it.