When creating or editing a custom lookup field, Salesforce typically provides options to define behavior when the referenced (lookup) record is deleted:
However, users may notice that this section is missing in some cases.
This occurs when the lookup field is self-referential, meaning the field looks up to the same object it is created on (for example, a lookup from Object_A to Object_A).
This behavior is by design.
When a lookup field references the same object:
Example scenario:
To prevent this, Salesforce enforces a default behavior:
No additional configuration is available for this type of lookup relationship.
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