Problem with some characters in complex objects

Hi all,
I've built a webservice which returns a complex object with several fields inside. All fields are public and accessable via getter and setter methods.
The problem is, that some of these fields contains numbers or underscores in their names.
For example:
public int field_a;
or
public String house3of4;
When I try to import these webservice as a model in a Web Dynpro project, it doesn't work until I remove these characters.
Is this a known problem or is there any solution for it?
Thanks
Thomas

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I am running
Hardware Overview:
Model Name:          Mac Pro
Model Identifier:          MacPro1,1
Processor Name:          Dual-Core Intel Xeon
Processor Speed:          2,66 GHz
Number of Processors:          2
Total Number of Cores:          4
L2 Cache (per Processor):          4 MB
Memory:          6 GB
Bus Speed:          1,33 GHz
Boot ROM Version:          MP11.005D.B00
SMC Version (system):          1.7f10
Serial Number (system):          CK7XXXXXXGP
Hardware UUID:          00000000-0000-1000-8000-0017F20F82F0
System Software Overview:
System Version:          Mac OS X 10.7.5 (11G63)
Kernel Version:          Darwin 11.4.2
Boot Volume:          Macintosh HD(2)
Boot Mode:          Normal
Computer Name:          Mac Pro van Juko de Vries
User Name:          Juko de Vries (jukodevries)
Secure Virtual Memory:          Enabled
64-bit Kernel and Extensions:          No
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