Creating relationships between one to multiple tables

Hi,

I have two data tables and two assist tables, one assist is a calender table and the other is for filters. (As I need unique values to create a relationship between two columns)

I have a Product Category column in both data tables. For example I have two visuals, one is based on DataTable1_Product Category and the other is based on  DataTable2_Product Category, both tables containing multiple values that means creating relationship between these two is not possible (as far as I know one of them has to contain unique values only). So I created an assist table containing only the unique Product Category values called filter table, to create a relationship between the assist table's Product Category and both the data table's Product Category columns. But here comes the issue, it only allows one of these relationships to be active and now one of my visuals is not filtered.

Is there any solution to this?

Any help is greatly appreciated, thank you!