German Umlaute in Bibtex in first line identifier

hi,

when I export my Zotero Bliliothek to Bibtex, first line of any output is without any umlaut. Everything else is just fine. The Umlauts are just cutted away in the Identifier.

Heres an Example:

@book{friedl_regulre_2007,
edition = {3. A.},
title = {Reguläre Ausdrücke},
isbn = {3897217201},
publisher = {{O'Reilly}},
author = {Jeffrey E. F. Friedl},
month = oct,
year = {2007}
},

first line should be:
@book{friedl_reguläre_2007,

It doesn´t matter if I export with utf8 or iso-8859-1 or anything else, the first line is always without any umlaut.

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