...
The following configuration establish that user Bruce Willis is not able to approve until the first user Casey Chapman approveapproves.
When Bruce Willis display views the issue, the action buttons appears disabled:
...
Only after Casey Chapman approbation, Bruce Willis is enabled able to accomplish the approval decision.
...
Notice that an abstention is evaluated same way of an approbation, while on rejection, the next approver, Brent Green, is not enabled to able to accomplish the approval decision.
...