Error when trying to mass renew receipt confirmation tasks in BPM worklist

Summary:

Error when trying to mass renew receipt confirmation tasks in BPM worklist. Attached steps.

Content (required):

Requester of the POs is assigned receipt confirmation task. When he logs in his BPM worklist and selects multiple tasks of same category and choose Renew from drop down option -

Getting the error - "Your request for 2 tasks was not successful.. Invalid action on workflow task or user does not have privilege to perform this action. Make sure that the action is valid with respect to the current state of the task or ensure that the user has privilege to perform this action on the workflow task"