Technicians the ability to delete communications from the Requestor Conversation

Technicians the ability to delete communications from the Requestor Conversation

I would like to allow technicians the ability to delete communications from the Requestor Conversation portion of a request. They currently have the delete button but they get a screen saying they do not have sufficiant rights when they attempt to delete a communication.
 
Example: A technician sent an email to ServiceDesk Plus with an incorrect request number in the subject. (##wrong request number##) The technician would like to delete the incorrect communication.
 
Does anyone know where the setting lives that controls this functionality?
 
Thanks,
Damon


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