If you are using the referential integrity plug-in with replication, you must enable it on all master servers. You do not need to enable it on hub or consumer servers.
The following limitations are associated with the use of the referential integrity plug-in in a replication environment:
The plug-in must be enabled on all servers containing master replicas.
You must enable the plug-in with the same configuration on every master.
It is not useful to enable the plug-in on servers containing only hub or consumer replicas.
For information about configuring the referential integrity plug-in, see To Configure the Referential Integrity Plug-In.