If you sync Salesforce opportunities with HubSpot deals and run a multi-currency Salesforce organization, you may see this alert in Hubspot: "It looks like you're using a Salesforce multi-currency organization. This is unsupported, and may cause some revenue fields to sync incorrectly. Would you still like to enable opportunity sync?"
While HubSpot supports multi-currency deals, the Salesforce integration currently cannot convert between currencies when syncing currency values. This means the number value will sync between Salesforce and HubSpot, and no exchange rates will be applied.