Hi from some post in this forum advised not to use BLS birth certificate as it is not accepted by CIC.
I have sent an affidavit made in Canada explaining non-availability of correct birth certificate of my spouse ( New born Name was missing on original certificate).
Package was returned stating - there has to be one document proof which has New born Name, DOB and Parent name.....There was passport, PAN card, Driving license, mariage cert, original BC, 10th school leaving (no parent name on it :-(),Visitor record canada etc in supplementary proof. Only Indian Passport has all three with mention of Name of father, name of mother. Still it is returned...it all depends on VO.
In returned package, CIC highlights what is missing and provide details about what is required....
Thus I applied new duplicate certificate in India, received a scanned copy, attached it to application...Thankfully I got Birth Certificate for my spouse within a week