@WU_Sandra 

As we mentioned earlier, we have yet to find any connector to sync data between QBO and Datev. You may utilize an exporter tool to export data from QBO to XLS, or utilize an importer tool to import data from CSV/XLS to your QBO account.

https:// transactionpro.grsm.io/qbo

Some of our clients have been using another accounting app. It has implemented the DATEV Export option in the app since 2 months ago if your company is registered in Germany.