Corporation Tax Online Filing

I am trying to file the corporation tax return using HMRCs online system for the first time.  Ive looked at their sample Accounts & Computation and see that the accounts have amortisation of Goodwill and Other Operating Income but can't see where they go in the computation.  My accounts have both of these items and im struggling to find where to put them in the computation.  If i put the operating income in any box as a negative value i get an error message.  I am only using HMRCs computation section, not the accounts section as I have accounts in iXBRL format.  Any help would be greatly appreciated.

Thanks