The instrument used to release fund which the minister of finance has earlier withheld is

The instrument used to release fund which the minister of finance has earlier withheld is a "Supplementary Warrant". A supplementary warrant is issued when additional funds are required for a particular purpose beyond the amount originally allocated in the budget. It enables the Minister of Finance to authorize additional expenditure without having to go through the process of amending the budget. The supplementary warrant is used to release funds that have previously been withheld by the minister of finance.