you have a timing difference of 90270$ because the amount of the asset was 145270$ which is 90270$ over the limit of 55000$. You can add a line under the Other section, with an amount of 90270$ to compensate for the difference. This way, your S8SUPP will not show the warning. You do not need to have the same amount on box D and Box C, you just need to know why there is a difference. You can also sign off that warning as long as you know why this amount is different.