diff --git a/src/overhaul_activity/schema.py b/src/overhaul_activity/schema.py
index ba6899f..32ca50b 100644
--- a/src/overhaul_activity/schema.py
+++ b/src/overhaul_activity/schema.py
@@ -5,7 +5,7 @@ from uuid import UUID
 from pydantic import Field
 
 from src.models import DefultBase, Pagination
-from src.scope_equipment.schema import MasterEquipmentRead
+from src.scope_equipment.schema import MasterEquipmentTree
 from src.job.schema import ActivityMasterRead
 
 class OverhaulActivityBase(DefultBase):
@@ -40,7 +40,7 @@ class OverhaulActivityRead(OverhaulActivityBase):
     service_cost: Optional[float] = Field(0)
     assetnum: str = Field(..., description="Assetnum is required")
     status: str
-    equipment: MasterEquipmentRead
+    equipment: MasterEquipmentTree
     overhaul_scope: OverhaulScope
     overhaul_jobs: Optional[List[OverhaulJob]] = Field([])
 
diff --git a/src/scope_equipment/schema.py b/src/scope_equipment/schema.py
index 1a8bde8..1bdfd6a 100644
--- a/src/scope_equipment/schema.py
+++ b/src/scope_equipment/schema.py
@@ -47,9 +47,10 @@ class MasterEquipmentRead(DefultBase):
     assetnum: Optional[str] = Field(None, title="Asset Number")
     location_tag: Optional[str] = Field(None, title="Location Tag")
     name: str
+
+class MasterEquipmentTree(MasterEquipmentRead):
     parent_id: Optional[UUID]
     parent: Optional[EquipmentMasterReadRef] = Field(None) # type: ignore
 
-
 class MasterEquipmentPagination(Pagination):
     items: List[MasterEquipmentRead] = []