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# Why can’t I create transaction rules between accounts with different foreign currencies?

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You cannot create transaction rules between two accounts, which have different foreign currencies. This is because Zoho Books maintains exchange rates only between a base currency and a foreign currency and not between two foreign currencies. 

![ ](/books/kb/images/banking/multiple-fc-error.png)

 So, when you create a new transaction rule for a bank account, the currency of the account chosen under the **Account** dropdown must either have the _same base currency_ as your organization or the _same foreign currency_ of the account for which you are creating the transaction rule. You can learn more about [transaction rules](/en-fr/books/help/banking/transaction-rules.html) from our help document.