SRS&BRS are the documents they r not applications to find bugs
SRS&BRS-If we find the bug in SRS or BRS it will be valuable for the organisation ,because we are trying to find the bugs from the point where they are originated i.e.SRS & BRS. Example:-if the requirement is not clearly specified or it is ambigous then it will impact on design,coding and almost on the whole application.
This Kind of bug would be logged as Spec bug against the Bussiness Analyst or Product Manager. The bug needs to corrected in form of a revised version of the document and the updated version should be sent across to the devlopment and testing team