Changing GL a/c currency, maintained in foreign currency, to Company Code currency

Hello Friends – We have got few GL Accounts maintained in foreign currencies and posting also made to these accounts.  Now, for some reasons, we need to change their currency to Company Code currency.

We have referred SAP Notes – 146824 and they say that it is possible to change the currency to local currency.

My doubt is that when I change the currency, I should reclass the balance to zero, once done, and then reclass the balances back.

Or I can directly change the currency?

Can you pls advice.

Thanks