diff --git a/api-v3/src/asset-master/merged-inventory-dossier.service.ts b/api-v3/src/asset-master/merged-inventory-dossier.service.ts
index 7309767..a475880 100644
--- a/api-v3/src/asset-master/merged-inventory-dossier.service.ts
+++ b/api-v3/src/asset-master/merged-inventory-dossier.service.ts
@@ -5,6 +5,8 @@ import { InventoryMergeService } from './inventory-merge.service';
 
 type LooseRecord = Record<string, any>;
 
+const MERGEABLE_DOSSIER_TYPES = new Set(['instalacion', 'subinstalacion']);
+
 function dedupeById<T extends LooseRecord>(items: T[]): T[] {
   const seen = new Set<string>();
   const result: T[] = [];
@@ -34,6 +36,16 @@ export class MergedInventoryDossierService {
   ) {}
 
   async dossier(requestedAssetId: string): Promise<Record<string, unknown>> {
+    const requestedAsset = await this.assets.getById(requestedAssetId);
+    const requestedTypeCode = requestedAsset.type.code.trim().toLowerCase();
+
+    // La conciliación/fusión existe sólo para Instalaciones y Subinstalaciones.
+    // Los registros territoriales (Departamento, Área, Yacimiento) deben poder
+    // abrir su Actividad sin depender del subsistema de merge.
+    if (!MERGEABLE_DOSSIER_TYPES.has(requestedTypeCode)) {
+      return await this.assets.dossier(requestedAssetId) as Record<string, unknown>;
+    }
+
     const mergeStatus = await this.merges.status(requestedAssetId) as LooseRecord;
     const canonical = mergeStatus.canonical as LooseRecord;
     const requested = mergeStatus.requested as LooseRecord;