A charge can be levied on the basis of document only when the document is a speaking one. The document should speak either out of itself or in the company of other material found on investigation and/or in the search. The document should be clear and unambiguous in respect of all the four components of the charge of tax. If it is not so, the document is only a dumb document. No charge can be levied on the basis of a dumb document. A document found during the course of a search must be a speaking one and without any second interpretation, must reflect all the details about the transaction of the assessee in the relevant assessment year