Sales Organization - Change View - Definition - Statistics Currency details

Dear Gurus,

I have just copied 1 sales organization from another one which is a Bulgarian Sales Organization.

Therefore the Statistics Currency Details need amending into a new currency which is the New Romanian Lei. My FI consultant has already created this new currency which didn't exist and which is RON. However, in "Sales Organization Change view", I cannot change the current currency which is BGN into RON...

How can this be? What steps do I have to follow to change it?

Your input is urgently needed.

Thanks

Chris