Unfortunately not all banks support the german umlauts or special characters like the "ß".
These special characters are allowed by specification:
- blank space " "
- dot "."
- comma ","
- the "&"
- dash "-"
- plus "+"
- star "*"
- procent-sign"%"
- slash "/"
- dollar "$"
Therse signs are shwon properly in the app.
The netbank and the Saprda-Banken are converting special characters in the transfer reason of a transaction. We have no influence on that.