The "Invalid Cross Reference ID" error in Salesforce happens when you're trying to use an ID that Salesforce cannot match to the correct record or object.
Common Causes and Fixes:
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Incorrect Record ID: Ensure the ID is 15 or 18 characters long and matches the correct object type (e.g., Account, Contact).
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Sandbox vs. Production: Check if the ID belongs to the correct Salesforce org. IDs from one org won’t work in another.
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Related Record Missing: Ensure referenced records (e.g., parent IDs) exist before creating or updating the main record.
For more details on Salesforce, check here.