In orgs with Multi-Currency enabled, the Opportunity Currency field may not appear on the edit page or may be uneditable via inline editing. This article explains the prerequisites for changing the currency on an existing Opportunity.
Organizations that have Multi-currency enabled have the option of setting the default currency for each Opportunity.
Before the currency can be modified, you'll first need to check the following:
Once you have confirmed the above, you can change the value. Here's how in Salesforce Classic:
Quick Tip: Check out our documentation on Setting your Corporate Currency and Manage Multiple Currencies
Note: Changing the Opportunity Currency will remove the Price Book associated.
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