Restriction on mortgage of property
13.  Where a charge or a pledge subsists over any immovable property belonging to a member or his spouse or both of them jointly under section 15(9), (9A), (10) or (10A), 21, 21A or 21B of the Act to secure the payment of the minimum sum into the member’s retirement account, the member or his spouse or both of them shall not mortgage, charge or otherwise encumber the immovable property unless with the prior written consent of the Board.