For consistency (and to avoid transliteration errors) I need to
convert a few databases from charset none to unicode_fss.
I tried using some data pumping tools to do this (specifically ibpump
and fbcopy) but both give me errors (ibpump has problems with circular
dependencies in the data structure (even when told to disragard these
constraints), fbcopy give an error message "XSDA:SetValue incompatible
types".

What can I do to fix this? Is there a possible manipulation on the
tables? Another tool which can help me?

Thanks for the help,
Joachim