What all OM setups impact after I swipe the Primary to secondary Ledger currency

Summary:

What all OM (EBS) setups impact after I swipe the Primary to secondary Ledger currency.

For example :

In my company , I have primary ledger "USD" and secondary ledger is in "JPY" Currency .

Now if i wanted to change Primary ledger to "JPY" and secondary ledger to "USD".

Then what all setup change in Order management i have to do as a consultant?

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