A recent property purchase has raised concerns during sale deed registration because the new deed omits the old survey number, despite referencing previous deeds and including updated details like a new survey number and patta. While the sub-registrar has registered the document, they've cautioned about potential future issues with the Encumbrance Certificate (EC). Legal advice suggests that the old survey number should ideally be included in the new deed. To address this, the buyer is advised to pursue a rectification deed with the seller to incorporate the missing old survey number and avoid future complications.