Every Sub-Registrar on registering a non-testamentary document relating to immovable property not wholly situate in his own sub-district shall make a memorandum thereof and of the endorsement and certificate (if any) thereon, and send the same to every other Sub-Registrar subordinate to the same Registrar as himself in whose sub-district any part of such property is situate, and such Sub-Registrar shall file the memorandum in his Book No. 1.