Dear Kiran,
Unfortunately, I don't have a test system so I cannot test this. To give you a hint please try the following:
Goto MSMP configuration(GRFNMW_CONFIGURE_WD) and edit the path the request is following to the stage of the owners/approvers. Select the stage and click "Modify Task Settings". Please mark the checkbox "Change Request Det" so that the request is editable for this stage. Also you can mark the checkbox "Runtime Cnfg Chng" to make the settings effective immediately.
See also (that's an example with role owner):
Please let us know if it works.
Regards,
Alessandro