I believe this is due to High Ascii data present in the source version. You need to avoid using High-ASCII data with 10.4 as LNUI is XML based and won't be handling it. Another way is to try using high_ascii_tolerence=1
The reason is moving data from non-unicode to unicode environment.
Also refer this link
But again, it will be problematic if you use HIGH ASCII characters with 10.4 unless Infor releases their latest version of LNUI where I guess it will be fixed. (LN UI 11.3.1)
Also, have a look at this standard document for Infor Enterprise Server Unicode Migration Guide(U8887)