Before you can run Workflow Reports, you must first turn on workflow auditing for each workflow type that you want to report on.
Auditing workflows degrades performance. Consequently, you should only enable workflow auditing for those workflows that you plan to use with Workflow Reports.
Turn on workflow auditing as follows:
For workflows that you can configure in the Administrator interface using task templates, select the Audit entire workflow checkbox on the Audit tab of the task template configuration form. See Configuring the Audit Tab for instructions.
For workflows that do not have task templates, refer to Modifying Workflows to Log Timing Audit Events.