I had functional IPMA for years on the system spanning from 11.X to 14 (latest). Single Assistants are both connected to Multiple managers, and sometimes single Manager has multiple Assistants. Everything was working fine, until we did upgrade to 14 (part of which was rebuilding the cluster (BARS), because there was no space left on active partition, and we had to use larger OVA)
From then on, IPMA still functions, but If I want to do a particular configuration change (adding second manager to the assistant that already has one Manager), I get the following error (on hitting "save" in Manager Configuration):
Add failed. Cannot insert a null into column (ipmauser.pool).
we tried to rebuild the database on cluster with no improvement, as well as taking RTMT dumps for IPMA not showing anything helpful. We also tried configuring it through BAT, but again, only first user was configured, while the other wasn't.