What is Requisitions On Title?

Legal Definition
in English conveyancing, are written inquiries made by the solicitor of an intending purchaser of land, or of any estate or interest therein, and addressed to the vendor's solicitor, in respect of some apparent insufficiency in the abstract of title. Mozley & Whitley.
-- Black's Law Dictionary
Legal Definition
Objections indicated by the vendee’s solicitor to apparent flaws in the vendor’s title.
-- Ballentine's Law Dictionary