S. 154 : Rectification of mistake-Mistake apparent from the record-Intimation-Appeal against intimation withdrawn on ground return selected for scrutiny-Regular assessment on scrutiny made without taking into account disallowances proposed in intimation-Rectification order in respect of delayed deposit of employee contributions to the provident fund and employees Stat Insurance-Change of law-No merger of orders passed under intimation and regular assessment-Rectification is proper.[S.143(1), 143(3)]