Back to basics - two object_how to link to same List box?

[#1]

I have to object - both straight tables.  The only different between the two are the dimension.  So one is more of a summary and one is detail of the summary.  When i filter they are not getting the same totals.  I think they are linked to the same link box, there is something else in the object that I think is excluded a total calcualtlion.For example, the first dimension and person name, second is customer, etc.  Summary box has name and customer.  Detail box has more information related to the order.  however, when i filter on an item in the list box i get different results

[#2]

Can you please send example?  Are Customers and Person diferent tables? May be something in joins between those. It's hard to tell without example.