Hi AR,
SAP standard does not offer the functionality to amortize ONLY the
premium/discount (or fees) over the duration of the contract using an
effective interest rate which includes the interest.
According to IFRS, fees (or premium/discount) are not amortized
separately. There is only one amortization logic (amortization posting)
for the complete cash flow (including all payments - principal,
interest, fees, premium/discount).
Maybe you need do use something like accrual/deferral for that?
Regards, Feng