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 75bc7bd..bd77ca9 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
@@ -123,13 +123,17 @@ export class F3FieldInventoryStructureService {
       [key: string]: unknown;
     };
 
-    // F5: the Inventory screens count only concrete instances confirmed/created in field.
-    // Legacy/context/catalog records intentionally remain false until explicitly validated.
+    // Área/Yacimiento remain structural context. A concrete Installation/Subinstallation
+    // created in field is a real Inventory instance from the moment it is registered.
     await this.dataSource.query(`
       UPDATE assets
-      SET is_inventory_instance=true,updated_by=$2::uuid,updated_at=CURRENT_TIMESTAMP
+      SET is_inventory_instance=$3::boolean,updated_by=$2::uuid,updated_at=CURRENT_TIMESTAMP
       WHERE id=$1::uuid
-    `, [created.asset.id, principal.userId]);
+    `, [
+      created.asset.id,
+      principal.userId,
+      typeCode === 'instalacion' || typeCode === 'subinstalacion',
+    ]);
 
     if (!family) return this.fieldInventory.detail(visitId, created.asset.id, principal);