Hi Jochen,
I solved the problem:
UtilitiesDeviceERPSmartMeterCreateConfirmation_In_Service_Impl stub = new UtilitiesDeviceERPSmartMeterCreateConfirmation_In_Service_Impl();
UtilitiesDeviceERPSmartMeterCreateConfirmation_In_PortType request = stub.getUtilitiesDeviceERPSmartMeterCreateConfirmation_BNDG();
BindingProvider bp = (BindingProvider) request;
bp.getRequestContext().put(BindingProvider.USERNAME_PROPERTY, USER);
bp.getRequestContext().put(BindingProvider.PASSWORD_PROPERTY, PASSWORD);
Maybe it helps for you, too.
Regards,
Harald