Issues in activating FIORI Apps on S/4 HANA

Hello experts,

I am actually customizing our S/4 HANA system so that we can get familiar with FIORI Apps. I could activate a lot of Apps but now I have issues in activating some special apps that seems to need some BW customizing e.g. the Trial balance app. Can maybe someone give me some hint what I have to activate/customize for them?

Thanks in advance.

Cheers Alex