Best Practice when country changes ISO currency code

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When a country changes it's ISO currency code (i.e. Venezuela changing from VEF to VES) what is best practice for revising General Ledger setup? 

• Define new Primary Ledger with new ISO currency code and associate existing Legal Entity to the new Primary Ledger, OR
• Define new Primary Ledger AND new Legal Entity BSV, assign new BSV to new Primary and transfer balances from old BSV to new BSV, end-date old BSV?
• Or other?

Thanks,

Mark