Cannot find my original post anymore, so I repost since I still have no sufficient information:On the takeoff reference page of the MCDU I need to enter an OAT for the origin airport. On the climb forecast page, there's an option to insert a temperature for the origin airport as well.The last line on the climb forecast page is automatically populated with the origin airport identifier, don't know if this can be changed and another navaid/waypoint can be entered. Anyway, the corresponding temperature field is empty (bracketed).I don't understand why the temperatures for the origin airport on both the takeoff reference and climb forecast pages aren't sync'ed. Maybe it won't harm the vertical path calculation if two different temperatures would be entered, but nevertheless I consider this a possible source of error...

Enter the Runway surface temp in the Climb forcast page, this 'should' then populate the Takeoff page otherwise it will default to ISA temp