Commissioner's objection bars settlement proceedings where concealment or fraud is established, subject to Settlement Commission review. Amendment to Section 245D allows the Commissioner to object to proceeding with a settlement application where concealment of particulars of income or perpetration of fraud for evading tax has been established or is likely to be established by any income-tax authority; such objection prevents the application from being proceeded with. The Settlement Commission may, after hearing the Commissioner and if unsatisfied with the objection, order that the application proceed and must send a copy of that order to the Commissioner.