Hi WaterMeths,
there's an Airbus Briefing Note about the Altimeter Setting:
http://www.airbus.com/fileadmin/medi...TECH-SEQ01.pdf
Though it doesn't provide any info about the baro-setting deviation that generates the ECAM caution, and neither does the FCOM. At this point, I'm quite keen to believe the caution comes with some new SDAC's standards, maybe listed in newest FCOM's bulletins. But it's just a guess ...
