Hi Carlos,
Thanks for your interest in Syncfusion Components.
We have initially created a list “Tablix Main”, then we have inserted another list “Tablix Campaign” inside the “Tablix Main” and finally we have inserted a tablix “Tablix Customer” inside the list “Tablix Campaign”. We have modified your RDLC report based on this and it can be downloaded from the below location.
Regards,
Vinoth S.