1. Since seller 'A' is abroad, can the rectification deed be executed by the GPA holder (please note GPA also has incorrect survey No.)
The GPA can execute a rectification deed now rectifying the correct survey number, The GPA deed is ot the title document of the property hence the wrong survey number in the GPAS will hardly matter.
2. Since GPA also has incorrect survey number, should it be rectified as well?
The GPA deed need not be rectified, but please make sure that what is mentioned in the original sale deed prior to GPA deed.
3. Original GPA in 2005 was unregistered, now if GPA needs to rectified, should the rectification be registered and if so, what is the procedure when the seller/ principal is abroad. Can he send the rectification GPA attested by Indian Consulate in his country of domicile?
There is no need for the GPA deed to be rectified.
4. What are the possible options for my friend to correct the survey number in the sale deed executed by the GPA holder?
How did he find the survey number to be wrong at this stage, he can try the same source to find the correct survey number too.
5. What would be the stamp duty charges for rectification deed (rectification of survey number) in Karnataka?
No stamp duty for rectification deed, only registration charges need to be paid.