Hi Hari
How a product is valued you have to define in the position management procedure. You can define there a one step valuation with security valuation only, a two step valuation where you split the valuation of the underlying and the fx gain/loss. You can also have a three step valuation where you define that the underlying is valued (security valuation, the fx is valued (fx valuation) and additionally an amortisation. In this case you have three posting in the valuation, one for security, one for fx and one for the amortisation. In the derived business transactions you have to define the relevant update types for each position management procedure according to the requirements.
Regards
Juerg