Dear AndakondaRamudu,
Thanks for your answer but it won't help in my case. As customer currency is US Dollar and creating sales document on Dollar only. While changing BP currency to Local currency at header lever system calculating Assessable value 3 decimal.
It seems this is a core application function. Can't see anywhere to tell system to consider only 2 decimal while changing BP currency to local currency on document level.
Hope this is clear now.
Thanks,
Chintan