It has no sense, I think you have signed the whole document, you can add
later more signatures and the first one continues to be valid, covering the
document and the second one the signed document.
But if you change the document in any way you can see in the signature field
thata the document has been changes and it's not valid.

I've tried the same and everytime I get an invalid Acrobat file (most of the
times) or a invalid signed file.

Best regards.

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