I am trying to upsert some data from gcp into Salesforce and getting the below error:

The Loan_Facility_Config_Id__c field should not be specified in the sobject data.

Loan_Facility_Config_Id__c is an external Id field and unique, and it is a text field, not auto-number or some other readonly fields. Why am I getting this error?

Also checked the permission set, seems the integration user has sufficient access to edit that field.



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