Revenue from Contracts with Customers is detailed by the Ind AS 115 that talks about revenue recognition from a contract with a customer for transfer of goods and services.  As per this AS when can revenue be recognized?

Solution

Under IND AS 115, revenue should be recognized when the performance obligation is satisfied. A performance obligation is defined as a promise to transfer a good or service to a customer. The satisfaction of a performance obligation occurs when control of the promised good or service is transferred to the customer. This means that the customer has the ability to use and benefit from the good or service and also bears the risks and rewards associated with ownership of the good or service.