Thanks for testing.
There are some misleading error messages. I will look into it. The problem was you did not &quot;apply metadata&quot; (from the tools menu) after creating a spreadsheet.
If you have any ideas I would really like to simplify the UI. A spreadsheet gets much more complex with multidimensional data model. My idea was that people who are familiar with tools like TM1 or BPC would use the system to create planning solutions for their small and mid-size clients.