China NAV 2009 to NAV 2015

Hi Guys,

I successfully upgrade a NAV2009 Database to NAV 2015 CU15.
So far all is working fine, even the Chinese language works fine in RTC. (language pack installed)

Except the data in the tables.
If I open e.g. Customer table in the field "Name", I see gibberish instead of Chinese letters.
If I copy the gibberish text back into "Name" field in NAV 2009 then Chinese letters appear.
If I copy Chines letters from the field "Name" (NAV 2009 database) into the field "Name" (NAV 20015 database ) again gibberish appears.

Both databases NAV 2009 and NAV 2015 use the same collation Latin1_General.

So it looks like some kind of conversion is done, but I am not sure what needs to be done to fix this.
(Double Character bytes is the issue, I assume )

Does anyone has any experience with this issue and can suggest something how to fix it.

Thanks for your help.