Exception Aggregation in Analytic or Calc View

Hi Everyone,

    I'm trying to perform something similar to BW exception aggregation on one of my HANA views. I need to get the maximum and minimum 'Net Value' for various Material/Customer combinations. I've created a column that concatenates the Material and Customer, however I can't find how to acquire the max and min values. I'm trying to avoid using SQL here as I believe there should be a way to do this graphically. I tried using the Min and Max aggregation on calculated columns, but I'm having trouble grouping this by the Material/Customer so it can fetch the MAX or MIN value specific to that MATERIAL/CUSTOMER. Here is an example of what I would like to see:

Any ideas? Thanks for your help!