Jureco - CJK - Problem

Hi Jens, hi all!
First of all, thanks again for this great package, where would I be 
without it...

I am using the latest MikTeX-Version of Jurabib together with the CJK 
package (for Chinese text and bibliography.) Everything works fine, 
except one bibtex entry, where I get the following message:

This is 8-bit Big BibTeX version 0.99c
Implementation:  Microsoft(R) C/C++ for Win32
Release version: 3.71 (18 Aug 1996)

The 8-bit codepage and sorting file: 88591lat.csf
The top-level auxiliary file: error1.aux
The style file: jureco.bst
Database file #1: test1.bib
Warning--you've exceeded 100%ld, the entry-string-size, for entry 
Umweltbericht:2004
while executing--line 2676 of file jureco.bst
*Please notify the bibstyle designer*
Warning--you've exceeded 100%ld, the entry-string-size, for entry 
Umweltbericht:2004
while executing--line 2676 of file jureco.bst
*Please notify the bibstyle designer*
Warning--Empty publisher in Umweltbericht:2004

Here's how much of BibTeX's memory you used:
  Cites:                 1 out of 7500
  Fields:               40 out of 125000
  Hash table:        34308 out of 35000
  Strings:            1349 out of 30000
  String pool:       10445 out of 750000
  Wizard functions:   7589 out of 10000
(There were 3 warnings)

And when I latex it afterways I got error messages. So something goes 
wrong with this entry.
I am using bibtex8 with the option "wolfgang" and jureco.
Can anybody help me out with this? I don't mind hacking bst-files if I 
get a good explanation of what- and how-to-do.

Due to encoding issues (chinese...Big5 encoding) I have attached a 
minimal example.

Thanks a lot in advance for your help.

best wishes

Markus


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\documentclass[12pt,a4paper]{scrbook}
\usepackage{CJK}
\usepackage{jurabib}

\begin{document}

\begin{CJK}{Bg5}{bsmi}
hallo\citeyear{Umweltbericht:2004}


 \bibliography{test1}

\bibliographystyle{jureco}
\end{CJK}
\end{document}

@BOOK{Umweltbericht:2004,
  title = {Zhongguo kechixu fazhan huigu baogao (2004). Shui, huanjing weisheng
    he renlei zhuqu lingyu. ¤¤°ê¥i«ùÄòµo®i¦^ÅU³ø§i (2004). ¤ô, Àô¹Ò½Ã¥Í©M¤HÃþ¦í°Ï»â°ì},
  year = {2004},
  editor = {{Quanguo tuijin kechixu fazhan zhanl"ue lingdao xiaozu bangongshi ¥þ°ê±À¶i¥i«ùÄòµo®i¾Ô²¤»â¾É¤p²Õ¿ì¤½«Ç}},
}