Approval required in between state change of Vulnerable item

When transitioning a vulnerable item to the 'Awaiting Implementation' state, it is  assigned to the asset's managed by groups. Under default setting, no approval is necessary for changing the state. The requirement is that during changin the state to 'Resolve' approval is required from any one of the member of the assignment group for auditing purposes. In the event of rejection, the vulnerable item should be redirected to the 'Open' state. Assistance is requested to implement this