How to get the external id from other system and update it in salesforce externalid field, if you get null value from another system how you will through an error?
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Answer / Mayank Kumar Singh
To update the External ID field in Salesforce from another system, first ensure that the External ID field is marked as 'External ID' and 'Unique'. Then, use the Update method to set the External ID value. To handle null values, you can create a custom validation rule that checks if the External ID is null before updating the record.
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