Hello @Michael-Overkamp, Thanks for your reply, I'll check into the database and let you know about the issue.

Hello @Terence,

in case you haven't figured it out yourself yet.
Here's the solution:

The CSV looks like this:

OBJTitle;Delivery Date;guarantee_period_dialog;guarantee_period_timeperiod backup0;2019-02-16;by delivery date;3 Years

Now you have to map it like :
csv-accounting.png

And then start Importing. Done

Best regards
Micha