How do we stop the IP Manager from creating the NetworkConnection relationship?

We have an ADSL service from a Internet Service provider with routers connected using different subnets. Some of the subnets have two ADSL routers and IP Manager creates a NetworkConnection which we do not require. The ISP cloud is in between the edge router and the ADSL routers which exist in the same /23 subnet and has a NeighboringSystem relationship.