Select a non key granularity attribute issue SSAS

Hi Friends,

I have small issue

in the Customer Dimension I have two primary key columns(surrogate keys) 1.CustID 2.CustRegID

I was making relations with other two fact tables SalesCust_Fact(CustID(Foreign Key)) and Reg_Fact(CustRedID(foreign key))

by using Customer Dimension 

So when I was making relations in the Dimension usage between Reg_Fact and Customer Dim based on CustRegID

it is claiming like this

if you select a non-key granularity, the server will not be able to aggregate data properly unless you make sure that all other attributes are directly or indirectly related to it by specifying them as related attributes 

The data for Reg_Fact is displaying repeated data. 

Can anyone tell me where I need to do changes please?

Thanks,

RK