1/ loud "ding" ECAM. Scares ya, now read the ECAM.
FCOM 3 says the message:-----
FUEL ZFW ZFWCG DISAGREE
This caution is triggered in case of disagree between ZFW or ZFCG values from FMGC 1 and 2.
– FMGC VALUES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONFIRM Confirm that the ZFW and ZFCG values from each FMGC are the same as the loadsheet values
2/ both crew double check their respective CDU's contain correct info as per loadsheet.
3/ Breath
4/ move along........these things happen.