[kronolith] Error importing and deleting calender

[lst_hoe02 at kwsoft.de]

Hello

with latest kronolith/horde if we try to import a single event mainly  
to bulk delete the calender we always get the following error:
"Der Kalender konnte nicht geleert werden:  
20120628151641.jfMxY06jTahP7Fk5ls10YuA at webmail.kwsoft.de not found"  
but with ever changing IDs. Deleting events by-hand works fine and  
maintenance delete also has no problems, but we need the import-delete  
to "reset" calender data.

Any idea how to solve this?

Thanks

Andreas