set 1013mb before pulling standard passing transition altitude. This is to prevent the wrong level being transmitted to ATC.
Understood, the OIT behind this made it to PPRuNe as well. Do you have any knowledge if the issue actually causes problems in your operating region? Within the range of EU seems it does not, despite some zealot calls we managed to survive without it. As someone said - it's not in the FCOM (OEB) and then fortunately there were no complaints.