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In order to achieve this requirement, place an authorization algorithmon the task ReviewAndCloseCase (as shown on the left) and specify a multivalued attribute in which all users are stored that may not execute this task (shown on the right).
Now all that needs to be done is make sure that at the end of the ad-hoc tasks AddFiles, ContactCustomer, MakeAssessment and UpdatePersonalInformation, the attribute Control.CaseOwners is updated. See the images below:
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