Case management framework Requester and Approval in a group


I have implemented the case management framework in our application. We have to achieve one functionality which is below:

Currently I have assigned the activity to the group to take some action. But I need to have the Approvals by the other users in the same group on the actions taken by the user.

Note: The Requester and Approver are in the same group. For example if the group have three users A,B and C and User A takes the action on the activity, User B and User C should approve that action and the same time User A should not be able to take any further action on the activity.

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