Incremental Updates and PKCS7 Signatures

Hello, this is my first message in this forum and I thank you in advance for your help.
I am developing a component to countersign PDFs. I was able to place the first signature ok, but when a countersign it problems come.
The way I countersign the document (as i read in the document "Digital Signatures in the PDF Language") is:
I create an incremental update with the following information:
1* Catalog changes
2* Info object
3* Acroform changes
4* New Annotation
5* New signature.
6* xref section
7* Trailer
The new signature is computed on the whole document but the signature new itself.
After this, not only the new signature is invalid, the previous signature becomes invalid althout there is no change in the previous version. I only have to remove the incremental update to get first signature to be valid again.
Acrobat Reader shows next message:
Error during signature verification.
Unexpected byte range values defining scope of signed data.
Details: byte range of signature is invalid.
I have reviewed thouse ranges several times but i did not find any error. Can anyone help me?
I could post a (badly) countersigned file if that could help.
Thank in advance,
José

Hello again. First of all, thanks again for your help.
I don't want to abuse but I have another problem with signatures.
I have two ways two sign a PDF.
A) Load the PDF, add the signature fields, sign and save.
B) Load the PDF, add the signature as an incremental update, sign and save.
I would prefer to use always the second alternative but problems come when I use method B to countersign.
If I sign a PDF with method A and then countersign using method B, I have a correct PDF with two signatures.
http://www.igijon.com/personales/josepm/RPACTCENTROS.SIGNED.signed_B.rar
If I sign and countersign usign method B, acrobat just ignore the second signature as it was not there, although It is able to detect changes after first signature.
http://www.igijon.com/personales/josepm/RPACTCENTROS.SIGNED.signed.rar
The incremental update is done always the same way, somethink like this:
%%EOF
1 0 obj
<<
/Type /Catalog
/AcroForm 26 0 R
/PageMode /UseNone
/Pages 2 0 R
/ViewerPreferences <<
/FitWindow true
/NonFullScreenPageMode /UseNone
/PageLayout /SinglePage
>>
>>
endobj
24 0 obj
<<
/CreationDate (D:20070824132228+02'00')
/ModDate (D:20070824132233+02'00')
/Producer (Burke - Componente de Firma)
>>
endobj
8 0 obj
<<
/Type /Page
/Annots [ 25 0 R 32 0 R ]
/Contents [ 5 0 R ]
/Parent 2 0 R
/Resources 6 0 R
>>
endobj
26 0 obj
<<
/Fields [ 25 0 R 32 0 R ]
/SigFlags 3
>>
endobj
32 0 obj
<<
/Type /Annot
/Border [ 0.000000 0.000000 5.000000 ]
/F 4
/FT /Sig
/M (D:20070824132233+02'00')
/P 8 0 R
/Rect [ 407.000000 58.000000 457.000000 16.000000 ]
/Subtype /Widget
/T (ContraFirmo yo)
/V 33 0 R
>>
endobj
33 0 obj
<<
/Type /Sig
/ByteRange [ 0 230122 250124 438 ]
/ContactInfo (Sin contacto)
/Contents <308 ... 000>
/FT /Sig
/Filter /Adobe.PPKMS
/Location (ContraFirmo aquí)
/M (D:20070824132233+02'00')
/Name (ContraFirmo yo)
/Reason (ContraFirmo porque si)
/SubFilter /adbe.pkcs7.detached
>>
endobj
xref
0 2
0000000000 65535 f
0000229283 00000 n
8 1
0000229602 00000 n
24 1
0000229465 00000 n
26 1
0000229712 00000 n
32 2
0000229772 00000 n
0000229997 00000 n
trailer
<<
/Info 24 0 R
/Prev 228481
/Root 1 0 R
/Size 34
>>
startxref
250310
%%EOF
I have tried to detect the error with the Preflight function of Acrobat and with the "PDF Appraiser" with no results.
Thanks again for your help.

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