[PKINIT]A doubt regarding certificate chaining in PKINIT code

[akshar kanak]

Dear team
        I have one doubt regarding the certificate chaining code in PKINIT
code .I am using kerberos 1.6.3 .
 In the function cms_signeddata_create() , why is variable
"include_certchain" specifically set to 1 .
Is there any specify reason to include the complete certificate chain in
 Signeddata ?

Thanks in advance

Thanks and Regards
Akshar