What does the Position Management procedure (PMP) for the transaction look like? TPM57A or Environment-Position Indicator from within FTR_EDIT?
Typical steps in PMP would be Amortization, Foreign currency valuation and Security Price valuation; you could have Impairments etc. too. 1 or more steps may be applicable.
In FTR_EDIT, if your Payment amount is different than the Nominal amount, then the difference should be amortized thru TPM1 (provided you have Amortization step in your PMP).
Similarly, if it is a Foreign currency bond, then Foreign currency valuation will take place thru TPM1. If it is a Listed bond, you can maintain price for your valuation date and Security price valuation can take place thru TPM1.
Let us know of questions.
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Mani