Under what circumstances a Sub-Registrar can refuse to register a document under The Registration Act, 1908?

Circumstances in which Sub-Registrar may refuse to register a document under the Registration Act, 1908 are:- Every Sub-Registrar refusing to register a document, except on the ground that the property to which it relates is not situate within his sub-district, shall make an order of refusal and record his reasons for such order in his Book No. 2 and endorse the words "Registration refused" on the document; and, on application made by any person executing or claiming under the document, shall without payment and unnecessary delay, give him a copy of the reasons so recorded. No registering officer shall accept for registration a document so endorsed unless and until, under the provisions hereinafter contained, the document is directed to be registered.