When we find  something wrong in BDD(Business Development 
Document) ,it has to be reported immediately to the 
reporting person  and he will take it to the top level 
management ,the top level mgt will discuss the issue and if 
its really wrong then they interact with the client and 
then rectify the mistake.

I don't know the process in your company, which methodology 
you follow - but the right thing to do is address the gap 
to the document "author" in which document you find the 
gap  and request to update the document. 
The main thing here is the "GAP" (which could be a missing 
requirement, incorrect req, conflicting with other req) 
should be addressed by the identified person only. since it 
makes a lot of difference if you go through a layer process 
to address it instead of addressing directly.

Correct me if I am wrong
Kiran
bommi_ki@yahoo.ca

Above answers are deviate from question!
Very simple answer is hwen ever we feel that (Due to our 
experience)funnctionality of the application is good but it 
is deviate from BDD 
or there is a differance in BDD and another requirement 
document
or while client interactions whatever we catch is wrong 
when compare to BDD then we confirm that BDD is wrong