Modify custom fields
Learn how to modify a legacy custom field of a standard object.
If changes to custom fields impact integration with related systems, you must update the configurations that access those field. For example:
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If you change the API name of the field, any integration that continues to use the old API name will receive an error. You must update integrations to use the new API name.
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If you decrease the length of a field, any integration that sends data that exceeds the new field length will receive an "Invalid_value" error. You must check the maximum length of data that integrations could send.