upsert throws error when I pass Id as externalIdFieldName in Beatbox API while contacting Salesforce
If you already know the salesforce Id of the record, just call update instead.
I'm using beatbox API to update/insert data in to salesforce opportunity object.
upsert() throws INVALID FIELD error when I pass Id as externalIDFieldName. Currently I'm using another unique external Id and it's working fine but I want to use the salesforce Id.
Please shed some light on what I'm missing.