Activating the IP-RP partnership in which IP entity has a disambiguation ID followed by other partnership works as expected.
Please follow the steps below:
1) created local entity (IP1) without disambuiguation ID
2) created one more local entity (IP2) with the same entity ID and different entity name with Disambiguation ID.
3) created remote entity (RP)
4) Created a IP-->RP partnership with IP1 local entity and RP remote entity. Don't activate.
5) Created a IP-->RP partnership with IP2 local entity and RP remote entity. Do activate. It gets activated.
6) Activate partnership created in step4. It gets activated.
And the fix will be available in r12.52 SP1 CR08.