SSRS Reports - FetchXML and attributes from linked entities

Hello,

I am struggling with my very first SSRS report. I have to create a table which contains fetch XML's main entity attributes and linked entities attributes. Somehow, the linked entity attributes are not being mapped into the table. What I am doing wrong? Executing fetchXML bring all the data with no issues. 

Is there any limitation with respect to this?

Thanks,
Jorge.