When I save a .csv from LibreOffice to be used as a DataTable, I got an error along the lines of ‘the data type is incorrect’ for a few int32 rows. It still imported the table, but those integer rows were showing no value. I opened the csv in text editor and resaved it, and then the table imported just fine, and then after re-opening it in Libre and saving it again, it continued to work just fine, so I think the issue lies in text encoding. The first time I saved it from Libre it was saved in unicode (Libre’s default). So, what text encoding does the DataTable importer support?
Ok, this thread is old and it’s most probably not of interest to you anymore, but I just found it and nobody answered as yet, so… 
I use LibreOffice as well to export sheets to csv for the Unreal Engine. I use utf-8, and I was worried at first, because I’m from germany and I need ä’s and ö’s and ü’s 
But it works just fine with everything, integers, strings and assets.
Hey, did you managed to import your ä’s and ü’s from CSV to DataTable? I have a problem with my ó’s, ę’s, ł’s, etc… 
They become “?” after importing. Here is what i mean: Import CSV to DataTable right characters - Character & Animation - Unreal Engine Forums
Hi Slavq,
yes, I did. I just used LibreOffice and exported to utf-8. It all worked well. What program and encoding do you use?