We get the majority of our tickets emailed to us, so they come in with most fields set to "not assigned".  I have some daily scheduled reports that look at some of these not set fields, and it makes the reporting inaccurate.

I have a number of fields required in Request Closing Rules but they only trigger when trying to close the ticket. 

Technicians can fully work a ticket without setting these fields until they need to hit close.  And I'm looking for a way to require these fields to be set earlier than at close, such as when the ticket is assigned (done manually), or they are emailing in the ticket, or adding entries to the worklog.

Can this be done?