3. Where a registration authority is informed under section 6 of the Act that a registration has become final (with or without modifications) or has become void, the authority shall indicate that fact in the register in accordance with Model Entry 27, 28, 29, 30, 31 or 32 as appropriate, with such adaptations and modifications (if any) as the case may require, and shall make any necessary amendment to the register map and any supplemental map.