Error in my if statement

[#1]

sum

(if(Naedo = 'Naedo',((Naedo_Collection + Transfer + Catch_all)*(-1) +(NaedoCollectedthisMorning))/(Amount_due_actual),null

()))

[#2]

the % are incorrect

[#3]

just check by manual calculation, what values u shud get then see how is it different form result in QV.

or post some figures here so the i can look into it