S. 143(1) : Assessment-Intimation-Rectification of mistake-Pending rectification application transferred from Central Processing Centre to jurisdictional Assessing Officer-Disallowance of entire expenditure grossly without notifying of adjustment-Rejection of rectification request on ground of no mistake apparent from record is held to be not justified-Matter remitted to Jurisdictional Assessing Officer to rectify mistake and allow assessee’s claim. [S. 154, Form No 10B]