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it seems you are not using the latest version 3.3. In earlier versions - delete rule set on relationship was used only in some cases to set delete rule on related foreign key. Now delete rule is transferred to FK as it's defined on relationship.
I assume you are using Oracle database - "Restrict" doesn't appear anymore for Oracle.
2. "SET NULL" is missing in this case.Most likely the foreign key is set as mandatory thus you cannot use "set null" as option.
Modeler creates duplicate wrong relationships while it engineers.Can you elaborate on that - example?