Oral admissions as to the contents of a document are not relevant, unless and until the party proposing to prove them shows that he is entitled to give secondary evidence of the contents of such document under the rules hereinafter contained, or unless the genuineness of a document produced is in question. https://www.leadindia.law/bsa-section-20-when-oral-admissions-as-to-contents-of-documents-are-relevant