Section 307 (2) of the Indian Succession Act

Hello, My mother passed away interstate leaving a property. I am the only child. My father is alive. He has given his NOC in my favor. I have gone through the process of acquiring Letter of Administration where court appointed me as the executor/beneficiary and issued Letter of Administration in my name. I am trying to sell the house but buyer's lawyer is saying that section 307 (2) prohibits me from the selling the house and I need to obtain court's permission. Here is the extract from the section: Section 307(2) in The Indian Succession Act, 1925 (2) If the deceased was a Hindu, Muhammadan, Buddhist, Sikh or Jaina or an exempted person, the general power conferred by sub-section (1) shall be subject to the following restrictions and conditions, namely:— (i) The power of an executor to dispose of immovable property so vested in him is subject to any restriction which may be imposed in this behalf by the Will appointing him, unless probate has been granted to him and the Court which granted the probate permits him by an order in writing, notwithstanding the restriction, to dispose of any immovable property specified in the order in a manner permitted by the order. (ii) An administrator may not, without the previous permission of the Court by which the letters of administration were granted,— (a) mortgage, charge or transfer by sale, gift, exchange or otherwise any immovable property for the time being vested in him under section 211, or (b) lease any such property for a term exceeding five years. Can someone kindly shed some light on this please?