Hi Nicola,
Thanks for the clarification. Judging from the [unixODBC] part in the error message it looks like the error message is coming from the driver manager. Like you have mentioned, the error message is truncated and it's the important part that gets truncated so it's hard to tell what the driver manager is complaining. Unfortunately I am not familiar with HANA Studio so I cannot tell you how to get the full message. I am more familiar with the ODBC driver side.
Regards,
Holman