charset and unicode

[atom]

I have defined the following rules in a elli.rule file:
se€
sbß
...

my rule file is in UTF8.

When I use it I have the following errors for each line who has a special character in (unicode?):
Cannot convert rule for use on GPU in file rules/elli.rule in line 4: sbß
etc...

How to do to make it work ?
I need to add my "special" characters in the charset files from the charsets directory? How do i specify to oclhashcat to use the good charset?

UTF8 is not supported here since the switch is char-to-char not chat-to-2char.