Copy Signed XML without altering it

Hi everyone,
I have a windows 2003 svr with JRE 1.6.0_18, and xmlsec v1.2.97 jar imported.
I'm building a new module of an existing application, which creates xml for invoices, signs them, and sends them to another company. This signed XMLs are stored on the filesystem.
I need to copy one of such xml files, lets call it A.xml (with valid signature, I checked using DOM's security validation tools) into another xml, lets say B.xml, without altering the contents of A.xml ( therefore voiding the signature ).
Then I have to sign B.xml
I have tried the following so far:
1. using Filereader to copy byte by byte to B.xml.
2. using inputstreamreaders (with apropriate encoding parameter) and copy line by line.
3. using DOM to add new node, and Transformer API to generate B.xml (proper enconding parameters are being set)
when I run a signature validation on B.xml, the signature has become invalid.
One intresting thing though, is that if I use method 1 to copy A.xml to another xml having only A's tree, this new XML has a valid signature.
Has anyone gone through something similar?
I'm I missing something?
or is it that whenever I insert an XML into another, it's signature will become void?
Thank you in advance for your help and time!
Regards,
Reynod

Well, #1 should work. Although I didn't understand what you said about "A's tree". Either you copy the file byte for byte (in which case you don't break the signature) or you produce something different (in which case you break the signature).
Anything which changes the contents of the XML should generate a document whose signature is invalid. That's the main point of signing a document.

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java.security.cert.CertPathBuilderException: [Security:090603]The certificate chain is invalid because it could not be completed. The trusted CAs did not inclu
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>
<15/01/2008 10:15:24 AM NZDT> <Error> <ALSB Security> <BEA-387022> <An error ocurred during web service security inbound request processing [error-code: Fault,
message-id: 3917705281899426819-4368b1eb.117762cff6e.-7fd8, proxy: DexServiceX509-Stub/Proxy Services/DexServiceX509-ProxyService, operation: null]
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<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Header/><soapenv:Body><soapenv:Fault xmlns:wsse="http://docs.oasis-open.or
g/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"><faultcode>wsse:InvalidSecurityToken</faultcode><faultstring>Security token failed to validate. weblo
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Version: V1
Subject: CN=x509, OU=x509, O=x509, L=Wellington, ST=Wellington, C=NZ
Signature Algorithm: MD5withRSA, OID = 1.2.840.113549.1.1.4
Key: Sun RSA public key, 1024 bits
modulus: 13052787793731294943682394984664645854838424340012907077330623....
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[pre]
$fault:
<con:fault xmlns:con="http://www.bea.com/wli/sb/context">
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</con:fault>
So is this a feature not supported in ALSB 2.6 yet or am I missing something dead simple?
Thanks in advance
Sam

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