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Level 9

Assuming the form is designed correctly, applyoing a second signature to a signed PDF will not "invalidate" the first signature, it will change the status of the first signature to something like "Valid with signed changes", this is expected behaviour.  Digital Signatures are meant to let you know when something has changed since it was signed.

Is your second signature actually invalidating the first suignature or just changing it's status?  You can post the form or a screen shot of the signature status to help clarify your issue.

Regards

Steve