The CBI is facing flak after questions were raised how the liquor baron was able to go abroad unhindered on March two that has triggered a political slugfest with the BJP and the Congress trading charges.
It had changed the nature of look-out notice against Mallya within one month of issuance from seeking his detention while leaving the country to that of merely providing information about his travel plans.
She said that along with the covering letter, proforma for the circular was attached in which the column related to seeking the detention of an accused was wrongly "ticked" by a SP-level officer.
The agency claimed detention under the look-out circular was only possible on the strength of a non-bailable warrant against an accused which was not the case with Mallya.
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A day after the look out circular was changed from seeking "detention" to "only providing information about his movements", Mallya arrived in India and appeared for questioning before CBI on December 9, 10 and 11, it said.
After opening of look-out circular, Mallya travelled abroad at least three times before his departure on March 2.
CBI had registered a case against Mallya, Kingfisher Airlines, Chief Financial Officer of the airlines A Raghunathan, and unknown officials of IDBI Bank in its FIR alleging that Rs 900 crore IDBI loan was sanctioned in violation of norms regarding credit limits on the basis of complaint received from the bank.