Let's clear the situation. What is the maturity date for the forward contract? If you want to post the realized valuation at the end of the maturtiy, you should use t-code TPM18. On the other hand, if you want to valuate at the end of the month, then you should have either swap points (table AT15) or reference int. rates (Market Risk Analyzer) to calculate it. In MRA, you first calculate NPV through yield curve which is based from ref. int. rates, then you post this in TPM1.
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