After updating a value in the ACT table for a session, PF3 shows the following message:
Why does this occur?
Release : 5.4
This happened because in the list of Sessions, 2 of them had the SAME 'Default Sessionid' of TSOPROD, these must be unique.
In this case, the upgrade was done from 5.0 to 5.4. Duplicates were allowed in earlier service packs for 5.0, this was corrected in SP6 and later.
Change the Sessionid, so each one is unique in the ACT.