[Tickets #419] Duplicate lessons when saving lessons

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Ticket URL: http://bugs.horde.org/ticket/?id=419
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 Ticket     | 419
 Updated By | Jan Schneider <jan at horde.org>
 Summary    | Duplicate lessons when saving lessons
 Queue      | Occam
 Version    | HEAD
-State      | Unconfirmed
+State      | Assigned
 Priority   | 2. Medium
 Type       | Bug
-Owners     | 
+Owners     | Jan Schneider
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