Messages IST1110I and IST1280I (sense code 08910006) received during CP-CP session activation failure

Problem statement: Attempt to activate CP-CP session pair between network nodes in two different networks fails.
Common symptoms: Activation of new CP-CP session pair between this network node and adjacent network node specified in message IST1110I is terminated.
Probable cause: A CP-CP session pair is not permitted between network nodes located in different networks unless you have specified BN=YES to enable the VTAM® border node function. The messages indicate that CP-CP sessions were attempted between two network nodes in different networks.
User response: If you want a nonnative relationship, ensure that BN=YES is coded to enable border node support. Also, ensure that NATIVE=YES is not coded on a PU or ADJCP statement that represents the partner node. If you want a native relationship, modify the VTAM start lists for the specific nodes so that both start lists specify the same network.