Six7heavy,
Nobody said that COD was incorrect.
If there is nothing in pilots books , maybe it is because it should not happen "normally" , nope ?
I guess that the manufacturer created this eicas message to tell the pilots :"hey guys , nearly no more fuel !".
It exists in the FIM only because , maybe , in the case of a real quantity indication defect , but i have never heard about it on the 777 ...
As per my own experience , fuel quantity indications faults are usually created by water (that can be seen on the maintenance pages and i would say that it is accurate on the -300 mostly).
Please read again :" no maintenance action is necessary " , it says all.
Common sense !