Net::KashFlow and broken XML produced by SOAP::Lite

ghenry has asked for the wisdom of the Perl Monks concerning the following question:

Dear all,

I'm trying to debug this method https://github.com/simoncozens/Net-KashFlow/blob/master/lib/Net/KashFlow.pm#L559

sub email {
    my ($self, $data) = @_;
    $data->{InvoiceNumber} = $self->{InvoiceNumber};
    for (qw/FromEmail FromName SubjectLine Body RecipientEmail/) {
        die "You must supply the $_ parameter" unless $data->{$_};
    }
    $self->{kf}->_c("EmailInvoice", $data);
}
[download]

but can't work out why it is producing broken XML due to the InvoiceNumber closing round everything:

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" 
+xmlns:s1="KashFlow/AbstractTypes" xmlns:soapenc="http://schemas.xmlso
+ap.org/soap/encoding/" xmlns:tns="KashFlow" xmlns:xsd="http://www.w3.
+org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-insta
+nce" soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
   <soap:Body>
      <EmailInvoice xmlns="KashFlow">
         <UserName xsi:type="xsd:string">my_user</UserName>
         <Password xsi:type="xsd:string">my_pass</Password>
         <InvoiceNumber xsi:type="xsd:int">
            <FromName xsi:type="xsd:string">Billing</FromName>
            <FromEmail xsi:type="xsd:string">billing@billing.co.uk</Fr
+omEmail>
            <RecipientEmail xsi:type="xsd:string">ghenry@ghenry.co.uk<
+/RecipientEmail>
            <Body xsi:type="xsd:string">Many thanks for your
business!

Please see attached invoice.

-- 
Kind Regards,

Billing.

E billing@billing.co.uk

http://www.billing.co.uk</Body>
            <InvoiceNumber xsi:type="xsd:int">239925</InvoiceNumber>
            <SubjectLine xsi:type="xsd:string">Invoice from billing fo
+r February 2015</SubjectLine>
         </InvoiceNumber>
      </EmailInvoice>
   </soap:Body>
</soap:Envelope>
[download]

code in https://github.com/simoncozens/Net-KashFlow/blob/master/lib/Net/KashFlowAPI.pm#L20 is:

EmailInvoice => {
    endpoint => 'https://securedwebapp.com/api/service.asmx',
    soapaction => 'KashFlow/EmailInvoice',
    namespace => 'KashFlow',
    parameters => [
      SOAP::Data->new(name => 'UserName', type => 'xsd:string', attr =
+> {}),
      SOAP::Data->new(name => 'Password', type => 'xsd:string', attr =
+> {}),
      SOAP::Data->new(name => 'InvoiceNumber', type => 'xsd:int', attr
+ => {}),
      SOAP::Data->new(name => 'FromEmail', type => 'xsd:string', attr 
+=> {}),
      SOAP::Data->new(name => 'FromName', type => 'xsd:string', attr =
+> {}),
      SOAP::Data->new(name => 'SubjectLine', type => 'xsd:string', att
+r => {}),
      SOAP::Data->new(name => 'Body', type => 'xsd:string', attr => {}
+),
      SOAP::Data->new(name => 'RecipientEmail', type => 'xsd:string', 
+attr => {}),
    ], # end parameters
  }, # end EmailInvoice
[download]

called using https://github.com/simoncozens/Net-KashFlow/blob/master/lib/Net/KashFlow.pm#L50:

sub _c {
    my ($self, $method, @args) = @_;
    my ($result, $status, $explanation) = 
        KashFlowAPI->$method($self->{username}, $self->{password}, @ar
+gs);
    if ($explanation) { croak($explanation) }
    return $result;
}
[download]

The data being passed to $self->{kf}->_c("EmailInvoice", $data) via $invoice->email() is:

$VAR1 = {
          'FromName' => 'Billing',
          'FromEmail' => 'billing@billing.co.uk',
          'RecipientEmail' => 'ghenry@ghenry.co.uk',
          'Body' => 'Many thanks for your
business!

Please see attached invoice.

-- 
Kind Regards,

Billing.

E billing@billing.co.uk

http://www.billing.co.uk',
          'InvoiceNumber' => '239925',
          'SubjectLine' => 'Invoice from Billing for February 2015'
        };
[download]

Any ideas how to trace this double InvoiceNumber getting opened and closed around the actual passed in data?

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