When running a SmartConnect map with a Xero destination, receiving an error that says “Failed to import XXX – Xero API returned error http code: ServiceUnavailable”   This seems to happen after 60 documents.  If the map is run again, it seems to process 60 more, and then returns the same error message.  

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The Xero API limits you to 60 inserts in a single session.  If you have more than 60 inserts to make, you will have to break the data source into multiple sets of 60 records.