Sub-rule (1) of rule 99 reads as follows:
"Where any return furnished by a registered person is selected for scrutiny, the proper officer shall scrutinize the same in accordance with the provisions of section 61 with reference to the information available with him, and in case of any discrepancy, he shall issue a notice to the said person in FORM GST ASMT-10, informing him of such discrepancy and seeking his explanation thereto within such time, not exceeding thirty days from the date of service of the notice or such further period as may be permitted by him and also, where possible, quantifying the amount of tax, interest and any other amount payable in relation to such discrepancy."
I concur with views of Shri Kasturi Sethi Ji.
These are ex facie views of mine and the same should not be construed as professional advice / suggestion.