Namespace prefix in Axis 2 - 1.7.3

[Sterpu Victor]

Hello

I use Axis 2, version 1.7.3.
I generated a SOAP client java source file with wsdl2java but I have 
problems using this service because the namespace prefix is not correct 
in the XML send from the client.
How can I set the namespace in Axis client?
Thank you,
Victor Sterpu