[rsDuplicateScopeName] More than one data set, data region, or grouping in the report has the name ‘CustomerName’. Data set, da

[rsDuplicateScopeName] More than one data set, data region, or grouping in the report has the name ‘CustomerName’. Data set, data region, and grouping names must be unique within a report.

Furthermore, I don't see anything in the Rectangle's "Data Region" dropdown to associate my tables to it.

Also, once I do successfully assign a rectangle to a Data Region (a table) successfully, I assume i can then reference fields from other DataRegions / Rectangles in other tables such as doing a summary table at the end based on all fields in previous rectangles

Finally, do all my tables share the same base dataset if really they're all using the same data, minus or plus a couple if different filters on the tables   It seems to conflict for example when I have a Fields!CustomerName in more than one table.