Restriction on mortgage of property
8.  As long as a charge or pledge subsists over any immovable property belonging to the member, 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, without the prior written consent of the Board.