stef, sorry.
The Warnings as seen by the pilot on ECAM would be IR2.
The rest of the line is the reporting computors.
If you get a warning in flight, produce a PFR when you have shut down. You can then see the original warning, and the reporters. Also in the maint section will be the code generated.
The ACARS sheet you posted contains all this in one line. makes it hard to interpret if you don't see it that way usually, and you never will on the aircraft.