Deactivate a Resource Instance
To deactivate a resource instance:
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            In the Work Definition work area , on the Manage Resources page, click the resource instance link that you want to deactivate. 
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            On the Edit Resources page, you can update the date in the Inactive On field to a future date. 
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            Click Save and Close. 
To use a deactivated resource instance, you must first reactivate it.