[Ejbca-develop] How can I insert a certificate for an extraCert into the database for RA mode?

[Taeyun K. <tae...@in...>]

Hi, 

Sorry if this is a basic question.
(I'm newbie to both CA itself and EJBCA, and I'm in somewhat urgent
situation.)

In the administrator's manual (https://www.ejbca.org/docs/adminguide.html),
there is a paragraph for a PKIMessage verifier named EndEntitySertificate as
follows:

'In RA mode, as a parameter, this module expects the name of the CA that
that has issued the certificate in the extraCert field. If a parameter is
specified, EJBCA will then check if the certificate in extraCert does exist
in the database, that it was issued by the right CA (the CA specified as a
parameter) and that it belongs to a registerd administrator in EJBCA with
the right authorizations to perform the operations required in the request.'

Question:
Here, I don't know the meaning of 'extraCert does exist in the database'.
How can I insert a certificate (that is, extraCert) into the database?

Thank you in advance.
Again, sorry for a basic question.