Kindly state detailed facts of your case

Legal Heir Certificate is only issued from revenue office of the district to identify a particular deceased persons living heirs.

In Bombay if person dies intestate leaving immovable property you need letters of administration from Bombay high court

LHC would not serve the purpose

What is property heirship certificate?

Do you refer to legal heirship certificate, if so, then it will be issued by the concerned revenue department/Tehsildar.

You can make the question a bit more clear to get a proper opinion.

If you are taking about the succession certificate issued by a execute magistrate is valid or not, yes it is valid.

Such declaration need not be registered at all.

So if the affidavit is done before the magistrate then it is alright.