I have found this link
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=867&top=6
States "Citizenship and Immigration Canada will accept ECA reports for five years from the date they are issued, so long as they were issued on or after April 17, 2013."
There are different views on weather applicants must submit their ECA report with their application or just provide the reference numbers. Though CIC has facility to check credentials with appropriate authorities, its always recommended to submit your ECA report along with your application.
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=867&top=6
States "Citizenship and Immigration Canada will accept ECA reports for five years from the date they are issued, so long as they were issued on or after April 17, 2013."
There are different views on weather applicants must submit their ECA report with their application or just provide the reference numbers. Though CIC has facility to check credentials with appropriate authorities, its always recommended to submit your ECA report along with your application.