> we have some problems by inserting data into an table. In our case, the
> customer inserts characters in a field varchar(XX) with special character
> “°”. This little ° with character set iso8859_1 and collation de_de by
> inserting generates a gds-exception error: 335544321 arithmetic exception,
> numeric overflow, or string truncation. Cannot transliterate character
> between character sets.

Both,

U+00B0 DEGREE SIGN (see above)
and
U+00BA MASCULINE ORDINAL INDICATOR

are part of ISO 8859-1 and at the same position (Unicode in the range
U+0000 to U+00FF and ISO 8859-1 are congruent). So the problem seems
to be with the Client Connection Character Set. Which one do you use?
Which Firebird version do you use on Server and Client?

Regards

Stefan