In some contracts a certain sum is received as ADVANCE....there is one more condition/stipulation in the said contract that unless the work of certain amount is done "Running Account Bill" can not be raised... say 50 lakh.
As at the year end...the situation may arise....advance is received...yet the work if not 50 lakh but say around 35 lakh is done... the revenue of 35 lakh may be recognised without even raising the invoice subject to however MATERIALITY of the amount of 35lakh