Comparing different aggregations levels

So, this problem involves 3 tables. A master data table let's call it customer table. A category table, that related a customer number to a category. Finally i have a fact table holding transactions. 

I wan't to create a visualization that shows summed amount for each customer and i also want to see how much that amount corresponds in relation to the entire category. 

Below i have tried to create a demo of what i would want end users to see. 

The problem is i don't know how to make the measure to right "Total Category Amount" ignore every filter on this table. Remember that the link between the table that holds the category is via the customer number. The customer master data is then linked to the fact table with the measures. It seems that power bi is troubled when i want to remove the customer number filter from the measure.

Here is also a very simplified version of the data model

Please help and tell me if you need more clarification.