creatorsname not correctly updated

Dears,

I've a tricky issue with this attribute. I context of 4 MMR & 4 replicas, I've defined a rootdn and a replication user. When I create "ADD" a new entry in my DB with rootdn as user, the creatorsname is filled up with the replication username instead of rootdn one :-| I've another configuration with 2 MMR & 2 replicas, normally same config as above, but there, the ADD is correctly managed. In both configuration, replicas send their ADD request to masters VIP with olcUpdateRef attribut. and received update via masters VIP with olcSyncrepl attribut.

Any idea of any parameter, acl, schema to check ?

Thx, J-L.