Fabric Plan writeback where dates and values have NULL

Hello,
I finished my first exercise with Fabric Plan with a Planning Sheet where I forcasted 2026 based on the historical data from previous year in the semantic model with fake data, actually the semantic model demo provided by Lumel, called "transaction-dataset".

I created a Fabric SQL Database and the corresponding connections to writeback the final Forecast. I clicked the Writeback button, finished, then went to the SQL Database and found the new table with data from the Forecast except for Year, Quarter, Month and Value, they all have NULL.

Planning SheetSQL Database

Am I missing any configuration?

Any help is greatly appreciated.

Thanks,

Fernando