Error when trying to translate

Hi there,
I'm getting the following error message when I'm trying to
translate my 
types:


Traceback (innermost last):
   Module ZPublisher.Publish, line 114, in publish
   Module ZPublisher.mapply, line 88, in mapply
   Module ZPublisher.Publish, line 40, in call_object
   Module
Products.CMFFormController.FSControllerPythonScript, line
109, 
in __call__
   Module Products.CMFFormController.Script, line 141, in
__call__
   Module Products.CMFCore.FSPythonScript, line 108, in
__call__
   Module Shared.DC.Scripts.Bindings, line 311, in __call__
   Module Shared.DC.Scripts.Bindings, line 348, in
_bindAndExec
   Module Products.CMFCore.FSPythonScript, line 164, in
_exec
   Module None, line 12, in createTranslation
    - <FSControllerPythonScript at
/isesite/createTranslation used for 
/isesite/geschaftsfelder-und-marktbereiche/geschaftsfelder-u
nd-marktbereiche>
    - Line 12
   Module Products.LinguaPlone.I18NBaseObject, line 121, in
addTranslation
AttributeError: translation_mutator


I checked with a folderish type that is closely related to
ATFolder 
(just two additional boolean fields). Apparently the error
is related to 
using the index attribute on the boolean fields and then
making those 
fields languageIndependent (see code below). I have this
error on 
another type which does not have any indexes in it, but I
thought I'd go 
one by one... does anybody know how I can solve the issue?
Do I have to 
create a mutator (whatever that is)?
Greets
Christian


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