Hi Axel,
From the screenshot, the factsheet giving an error seems to be 'GL Account' .
Try this
https://fioriappslibrary.hana.ondemand.com/sap/fix/externalViewer/#/detail/Apps('F0129')
What is the backend system you are using ?
IS it an ERP EHP 7 (with simple finance ?) or S4 HANA ?
Regards,
Suneeth