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Your form is missing a fee / quantity select, please add one in the form edit in the administrator area, check the migration guide: https://compojoom.com/documentation/matukio-new?view=book&page=114:Migration%20Guide%20to%20Matukio%207.0.0. Did you load and save the booking form once?
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Edit the Event form for Sommerakademie 2018 - Leider schon ausgebucht first
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