ZFW ZFCG DISAGREE
Disagreement between pilot entered values and FCMC values
From DSC FUEL
In my opinion, since zfw can only be pilot entered but fuel quantity can also be FCMC sensed, a difference between pilot entered FOB and or ZFW/ZFCG in INIT B page can lead to a difference between GW/GWCG calculated by FCMC and FMC. However the caution refers to ZF values which are obviously independent of fuel and can only be pilot entered...