Multiple rowfields in crosstab

When I try to concat fields in the row definition of the crosstab, it creates an endless empty report.

I have a simple datasource with fields: code, description, year, cost
I want code + description together in the row, year as colums and sum(cost). Cannot get this to work.

Maybe it’s the sheer number of combinations for code and description? Or the description is way to long to be rendered in a crosstab cell? Attaching a playground project for the sample application that does the job just fine:

image

2-fold-crosstab-test.srt (33.1 KB)