=item freq_override
If set, then override the normal frequency and look for a part_pkg_discount
-to take at that frequency. This will exclude any packages that aren't billed
-on a monthly cycle.
+to take at that frequency. This is appropriate only when the normal
+frequency for all packages is monthly, and is an error otherwise. Use
+C<pkg_list> to limit the set of packages included in billing.
=item time