[389-users] Certificate between 389DS and Active Directory

Hello, I try to follow this procedure : https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Directory_Server/8... Everything works fine, except I don't understand right this line: "Import the CA certificate from Directory Server into Active Directory. Click *Trusted Root CA*, then *Import*, and browse for the Directory Server CA certificate." For me CA certificate, it's a certificate from the Authority, so in my Active Directory the certificate from the authority is already know in the Trusted Root CA. So, do I need to import 389DS server certificate in my active directory ? And finally, there is no indication to do that, someone can help me to pass through ? Thanks in advance. Best regards, Alex