Exchange rate for export of service

mvramana (Student) (285 Points)

01 May 2020  
Dear Forum,
As per Rule 34 of CGST Act, exchange rate for the purpose of determination of value of export of services is the rate of exchange determined as per the generally accepted accounting principles for the date of time of supply in terms of Sec.13.

my query:

what is the rate that is generally accepted accounting principles..?

Which rates whether RBI declared rates or the rates applicable to goods as notified under Customs law, are to be considered..??