Whether appearance of POA instead of the appearance of party to the suit can be admitted?

Man Kaur (Dead) By LRS. vs Hartar Singh Sangha (2010) 10 SCC 512

Held: Where a party to the suit does not appear in witness box and state his own case on oath and does not offer himself to be cross-examined by the other side, a presumption would arise that case set upon by him is not correct