Accounting of sale of services to forien clients

We need to consider exchange rate fluctuation for sales effected for all foriegn sale of services. According to AS 11 we have to take all the transactions..  I have understood your doubt.  If the amount from the client is unpaid then we need to restate  debtor balance and should recognize exchage gain or loss in P&L  on the Balance Sheet date at the rate on the same date ( BS date)
 

Is there any disallowance for Forex Loss under Income Tax Act