You need to configure the Maintenance Request relationships to the other tables.

Maintenance Report — Parental; Technician — Referential, Restrict Delete

The Maintenance Report relationship must use Parental behavior. A report is operationally dependent on its Maintenance Request: deleting the request must delete the related report, and assigning the request to a new owner must also assign the report. Parental behavior supplies cascading behavior for operations such as Assign and Delete, which matches both requirements. The Technician relationship must use Referential, Restrict Delete. The technician is an independent master record and must not be reassigned merely because a maintenance request changes owner. Restrict Delete also protects the related record arrangement where deletion would violate an existing reference. Referential, Remove Link would clear the lookup instead of blocking the relevant deletion, so it does not meet the stated protection requirement. This decision aligns with the AB-410 Study Guide objective “configure table relationships,” including selection of relationship behavior according to ownership and cascade requirements.

Study Guide reference/topic: “Build data models — Configure table relationships.” AB-410 Study Guide | Microsoft Learn technical reference