Schedule Restriction Based on Route of Flight
In addition to the explicit Operational Parameters checkboxes described in the
previous tutorial, you can also add implicit currency adherence restrictions 
based on route of flight.
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<b>Example</b>: You want to restrict your pilots from creating schedules to 
<b>KHAF</b> unless they're current on the Night Cross-Country custom currency.
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Setup:
<ul>
	<li>Edit the applicable custom currency definition and add the exact text
		<code>[sch_restrict][restrict_airp=KHAF]</code> to the Description field.</li>
</ul>

Operation:
<ul>
	<li>Unlike in the previous example, there is no new "Operational Parameters" section
		on the Schedule Entry screen.</li>
	<li>Instead, before saving the schedule entry, the system will check the
		airports in the Route field. If the Route contains KHAF and the 
		Night Cross-Country currency is not met, the save is disallowed.</li>
	<li>Note that administrators can still schedule pilots as desired.</li>
</ul>