diff --git a/api-v3/src/inspection-visits/f3-field-inventory-structure.service.ts b/api-v3/src/inspection-visits/f3-field-inventory-structure.service.ts
index f1406bf..0f9779b 100644
--- a/api-v3/src/inspection-visits/f3-field-inventory-structure.service.ts
+++ b/api-v3/src/inspection-visits/f3-field-inventory-structure.service.ts
@@ -61,7 +61,7 @@ export class F3FieldInventoryStructureService {
     principal: AuthPrincipal,
   ) {
     const base = await this.fieldInventory.types(visitId, parentId, principal) as unknown as FieldTypesBase;
-    const effectiveParentId = parentId ?? base.context.area.id;
+    const effectiveParentId = parentId ?? base.parent.id;
     const parent = await this.parent(effectiveParentId);
     const expectedTypeCode = STRUCTURAL_CHILD[parent.typeCode.toLowerCase()];
     const data = expectedTypeCode