The FIELD_INTEGRITY_EXCEPTION error in Salesforce occurs when a field value doesn't meet the expected format, data type, or constraints like picklist options or validation rules. To fix it.
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Ensure the data matches the field's type (e.g., text or number). 
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Use only allowed picklist values. 
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Review and update any restrictive validation rules. 
For detailed troubleshooting, check this guide. Learn Salesforce here.
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