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title: Invalid field for upsert (Deployment assistant) description: How to solve Salesforce deployment error /Error (.) Invalid field for upsert, must be an External Id custom or standard indexed field: (.) ((.*))/gm

Invalid field for upsert

Detection

  • RegExp: Error (.*) Invalid field for upsert, must be an External Id custom or standard indexed field: (.*) \((.*)\)

Resolution

You tried to use field {2} for an upsert call in {1}.
- Is it declared as externalId ?
- Is the customIndex source file present in the deployment ?
- If it is declared as externalId and customIndex is present, you may have to go manually define the field as externalId in the target org