"The audit observed two instances where Ministry of Finance violated its own orders regarding prior approval of CAG before re-appropriation," the report said.
It said total original provision as a whole under '41-Secret Service Expenditure' pertaining to police under Home Ministry for 2017-18 was Rs 163.65 crore.
The report said that Home Ministry issued a re-appropriation order of Rs 150 crore in January last year to increase the provision under the above object head with the approval of the Finance Ministry.
Citing another instance, the report said the original provision pertaining to 'cabinet' under Home Ministry was only Rs 5 crore.
It said the Home Ministry issued a re-appropriation order on February 7 last year of Rs 1.25 crore to increase the provision under object head '41-Secret Service Expenditure' with approval of Finance Ministry.
In its reply to the Comptroller and Auditor General, the ministry said that it is the responsibility of the department concerned to get the approval of the CAG before re-appropriation.
"The reply is not acceptable, as it is the responsibility of Ministry of Ministry of Finance to ensure that the increase in secret service expenditure over the Budget provision concurs with the prior approval of the CAG," said the report.