Need help with a joined data source

Hi All,

I am trying to create a data source, and eventually a report, which shows all the buying center relationships for a Parent Account and all it's Child accounts.

I think i'm supposed to create a joined data source using buying center and account master data, and join it on Name (= Account Name).

Then I would present a selection to the user to enter the Account Master Data Parent Name and then it would join to buying center and show all relationships where the Account = (selection), and the relationships where the Account is a child account of that Parent.

I tried to do this (below) but when I create the data source all I get is the Name key figure, nothing else

Data source

any advice is appreciated, thanks in advance