RPO and Employee Referrals - do you pay them a referral bonus on top of the fees paid to the RPO provider?

I'm curious if any organizations still allow employee referrals for roles that have been outsourced to an RPO provider. If your organization DOES allow referrals, do you pay them a referral bonus on top of the fees paid to the RPO provider?

We are considering eliminating referral bonuses for entry-level positions, but especially those positions we've outsourced to an RPO provider. The rationale is that we are paying the RPO vendor to source.