Circular No. 669-Income tax Attention is invited to Board’s Circular No. 581, dated 28-9-1990 [Clarification 1], wherein it was, inter alia, stated that where a deduction claimed is disallowed as, prima facie, inadmissible for want of evidence in support thereof under section 143(1)(a), it cannot be subsequently allowed by a rectification order under section 154
