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Hi,
I have a PDF with some form fields with the same name, so that if one field gets input, the other fields with the same name getting the entered value as well.
After merging such documents the duplicate field names are changed by some characters appended at the end. This breaks the previously described functionality entering a value in one field and mirrored to all corresponding fields.
I found that with setting the documents Form.FieldAutoNaming false the field names should not change anymore. But if applied the corresponding fields later in the merged document are not available anymore in Acrobat Reader.
Please see the attached sample project...