How can it be confirmed that a CICS region is really running IDEAL 15.1? The messages in the CICS log don't specify the version, and going into IDEAL in CICS doesn't seem there is a panel that shows what version is running on that region.
Release : 15.1
Component : IDEAL
The Ideal version is actually displayed on the Ideal Sign-On panel when you start the IDEA transaction:
WELCOME TO IDEAL nn.n. HELP NEW SHOWS NEW FEATURES
as you can read on the "Sign On and Off" section of Ideal 15.1 documentation.
Moreover, once you have started an Ideal online session, you can also issue the Ideal command @I$INTERNAL STATUS, where you can find the release info for Ideal, IPC and Datacom too.
See Diagnostic Tools section of Ideal 15.1 documentation.