In a report tabled in the Lok Sabha, the CAG said an amount of Rs 6,831 crore was lying in banks at the end of March, 2016, due to procedural lapses.
The report said substantial amount of expenditure was not booked to the pension head and was lying under RBI suspense head because of the inability of the banks to furnish the pension payment scrolls.
The defence pension is disbursed to over 25 lakh pensioners, involving an expenditure of over Rs 60,000 crore every year.
"There was a need for review of the authorisation process, so that it is less cumbersome and less time- consuming," it said.
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The CAG said the transmission errors as well as other mistakes in the banks, which account for nearly 75 per cent of the pension disbursements, had resulted in numerous cases of underpayments and overpayments.
"Based on test check for one month, cases of 21,434 pensioners were identified who were underpaid, amounting to Rs 106 crore.
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