Hi Ammar,
I tried to replicate the same in one of my trials. I created a custom entity "Currency Exchange rate". And I wrote a workflow on update of Exchange Rate. The Workflow creates
new "Currency Exchange rate" with its fields updated with new exchange rate.


Hope it Helps!
Regards, Abhishek Bakshi If you find this post helpful then please Vote as Helpful and Mark As Answer. Check my blog on https://mydynamicscrmblog.wordpress.com/