Conversion from a UCS-2 CCSID to an Alphanumeric CCSID might not convert all characters successfully.
0
Cause . . . . . : When UCS-2 data is converted to Alphanumeric data, characters in the UCS-2 data that are not in the Alphanumeric character set cannot be converted successfully. The conversion will result in a substitution character being placed in the result data.