Report Painter - Customer Aging Report - Credit Risk

I have created a Customer Aging report for the client with Report Painter.

It is a standard report with columns for the Customer name, and outstanding balances for less than 10 days, between 11 and 30, and then the usual 30 days periods. The client would like to add a column after the customer name with the Credit Risk Rating (KNKK-CTLPC) .

I can see Credit Control Area and Risk Category in available characteristics.

but I have tried several things to add it to the form and/or report, but mostly get the error message that it is not available.

1) Is it possible to add this field as a column and

2) if yes, how can I add it?

Thanks in advance.

Francois