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 5e9f1d0..1456bd6 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
@@ -28,6 +28,16 @@ type ParentRow = {
   inventoryFamilyId: string | null;
 };
 
+type FieldTypesBase = {
+  context: {
+    area: { id: string; code: string; name: string };
+    operatorCompany: { id: string; code: string; name: string };
+    inspection: { id: string; code: string; status: string };
+  };
+  parent: { id: string; code: string; name: string };
+  data: Array<Record<string, unknown> & { id: string; code: string; name: string }>;
+};
+
 const STRUCTURAL_CHILD: Record<string, string | undefined> = {
   area: 'yacimiento',
   yacimiento: 'instalacion',
@@ -48,12 +58,8 @@ export class F3FieldInventoryStructureService {
     parentId: string | undefined,
     principal: AuthPrincipal,
   ) {
-    const base = await this.fieldInventory.types(visitId, parentId, principal) as {
-      context: { areaId: string };
-      parent: { id: string; code: string; name: string };
-      data: Array<Record<string, unknown> & { id: string; code: string; name: string }>;
-    };
-    const effectiveParentId = parentId ?? base.context.areaId;
+    const base = await this.fieldInventory.types(visitId, parentId, principal) as unknown as FieldTypesBase;
+    const effectiveParentId = parentId ?? base.context.area.id;
     const parent = await this.parent(effectiveParentId);
     const expectedTypeCode = STRUCTURAL_CHILD[parent.typeCode.toLowerCase()];
     const data = expectedTypeCode