Mobile Reports SQL 2016 vs. Power BI - duplicate values table relationship

Hi,

I've tried to add budget table and sales table to Power BI model, but can't create a relationship using product key, since both got duplicates in them. However, in Mobile Reports SQL 2016 there is no problem. Filtering works, whichever table's product key I use.

I know about star schema, how to do it correctly in Power BI etc. I'm just curious why Microsoft has taken 2 different approaches between similar products...

For a regular user, it would be much easier, not to think about the dimension tables at all.

Cheers,
Kaarel.