1. Once a document has been duly admitted in evidence its admissibility is no longer open to question in the suit or in appeal. This was held in :
A Venkata Rao V Ramakrishna AIR 1977 AP 247
B Nanga V Dannalal AIR 1962 Raj. 68
C Ettuhara Warier V Kochu Narayana Menon 1962 KHC 54
