my $som = $soap->call(
    'CheckForSoftwareUpdates',
    SOAP::Data->name(
        'InstalledSoftware' => \SOAP::Data->value(
             SOAP::Data->name('SoftwareName')->value('SampleSoftware1'),
             SOAP::Data->name('Version')->value('1.2.3'),
             SOAP::Data->name('OperatingSystem')->value('Windows_XP'),
        )
    )
);