UTF8TOCHAR(x) returns a CHAR value holding x converted from UTF-8.
>>-UTF8TOCHAR(x-+----+-)--------------------------------------->< '-,c-'
When x is converted from UTF-8 to CHAR, the CODEPAGE option is used to specify the target code page.
The code page must have a computational type and is converted to type FIXED BINARY (31,0). The code page must specify a valid, supported code page.