Hi Manolo,
Thank you for contacting Syncfusion Support.
It is always that the field members used in relational datasource should be of string type. But, you have used Boolean values for that field members. So, please change the Boolean values as string (“true” and “false”) for the field “Active” in your datasource.
We have modified the sample with the mentioned changes in datasource. And find the sample in the following link.
Please find the below screen-shot taken from the modified sample for your reference.
Regards,
Ramesh G.