diff --git a/web-v2/src/pages/AssetEditorPage.tsx b/web-v2/src/pages/AssetEditorPage.tsx
index 03abd55..ee13884 100644
--- a/web-v2/src/pages/AssetEditorPage.tsx
+++ b/web-v2/src/pages/AssetEditorPage.tsx
@@ -158,21 +158,27 @@ export function AssetEditorPage() {
   useEffect(() => {
     if (!canReadRelations || selectedType?.operationalRole !== 'GENERIC' || !parentId) {
       setOperationalAreas([]);
-      if (!parentId) { setOperationalAreaId(''); setOperatorCompanyId(''); }
+      if (!parentId) { setOperationalAreaId(''); if (!editing) setOperatorCompanyId(''); }
       return;
     }
     listOperationalAreas(parentId).then((loadedAreas) => {
       setOperationalAreas(loadedAreas);
-      if (operationalAreaId && !loadedAreas.some((area) => area.id === operationalAreaId)) { setOperationalAreaId(''); setOperatorCompanyId(''); }
+      if (operationalAreaId && !loadedAreas.some((area) => area.id === operationalAreaId)) {
+        setOperationalAreaId('');
+        if (!editing) setOperatorCompanyId('');
+      }
     }).catch((requestError) => setError(errorMessage(requestError)));
-  }, [canReadRelations, selectedType?.operationalRole, parentId]);
+  }, [canReadRelations, selectedType?.operationalRole, parentId, editing]);
 
   useEffect(() => {
-    if (!canReadRelations || !operationalAreaId || selectedType?.operationalRole !== 'GENERIC') { setOperationalCompanies([]); return; }
+    if (editing || !canReadRelations || !operationalAreaId || selectedType?.operationalRole !== 'GENERIC') {
+      setOperationalCompanies([]);
+      return;
+    }
     listCompaniesForArea(operationalAreaId).then(setOperationalCompanies).catch((requestError) => setError(errorMessage(requestError)));
-  }, [canReadRelations, operationalAreaId, selectedType?.operationalRole]);
+  }, [editing, canReadRelations, operationalAreaId, selectedType?.operationalRole]);
 
-  const changeType = (nextTypeId: string) => { setTypeId(nextTypeId); setParentId(''); setOperationalAreaId(''); setOperatorCompanyId(''); setAttributeValues({}); setParentSearch(''); };
+  const changeType = (nextTypeId: string) => { setTypeId(nextTypeId); setParentId(''); setOperationalAreaId(''); if (!editing) setOperatorCompanyId(''); setAttributeValues({}); setParentSearch(''); };
   const setAttribute = (definitionId: string, value: unknown) => setAttributeValues((current) => ({ ...current, [definitionId]: value }));
 
   const save = async (event: FormEvent) => {
@@ -182,7 +188,7 @@ export function AssetEditorPage() {
       const attributes = normalizeAttributeValues(definitions, attributeValues);
       let saved: AssetDetail;
       if (editing && id) {
-        if (canEdit) saved = await updateAsset(id, { typeId: canDirectContextEdit ? typeId : undefined, code, name, commonName: commonName.trim() || null, parentId: canDirectContextEdit ? parentId || null : undefined, operationalAreaId: canDirectContextEdit ? operationalAreaId || null : undefined, operatorCompanyId: canDirectContextEdit ? operatorCompanyId || null : undefined, description: description.trim() || null, attributes });
+        if (canEdit) saved = await updateAsset(id, { typeId: canDirectContextEdit ? typeId : undefined, code, name, commonName: commonName.trim() || null, parentId: canDirectContextEdit ? parentId || null : undefined, operationalAreaId: canDirectContextEdit ? operationalAreaId || null : undefined, description: description.trim() || null, attributes });
         else if (asset) saved = asset; else return;
         if (canChangeStatus && saved.informationStatus !== status) saved = await updateAssetInformationStatus(id, status);
         if (canChangeOperationalStatus && saved.operationalStatus !== operationalStatus) saved = await updateAssetOperationalStatus(id, operationalStatus);
@@ -229,9 +235,9 @@ export function AssetEditorPage() {
       <form className="panel form-panel" onSubmit={save}>
         <div className="form-section"><div><h2>Identificación</h2><p className="section-copy">Conservá el nombre técnico y, cuando exista, agregá el nombre habitual usado en campo.</p></div><div className="form-grid"><label className="field"><span>Código DH</span><input value={code} onChange={(event) => setCode(event.target.value.toUpperCase())} disabled={!canEdit} required maxLength={120} pattern="[A-Z0-9][A-Z0-9._/-]*" /></label><label className="field"><span>Nombre técnico</span><input value={name} onChange={(event) => setName(event.target.value)} disabled={!canEdit} required maxLength={200} /></label><label className="field"><span>Nombre habitual / sobrenombre <em>opcional</em></span><input value={commonName} onChange={(event) => setCommonName(event.target.value)} disabled={!canEdit} maxLength={200} placeholder="Ej.: tanque grande, ET vieja, batería norte…" /><small>También se usa en las búsquedas del Inventario.</small></label></div><label className="field"><span>Descripción <em>opcional</em></span><textarea value={description} onChange={(event) => setDescription(event.target.value)} disabled={!canEdit} maxLength={4000} rows={2} /></label></div>
 
-        <div className="form-section"><div><h2>Ubicación en la estructura</h2><p className="section-copy">Elegí qué es y dónde está contenido. El contexto Área–Operadora se completa a partir de esa ubicación cuando es posible. Los registros ya consolidados cambian de contexto desde el bloque histórico inferior.</p></div><div className="form-grid"><label className="field"><span>Tipo de elemento</span><SearchableSelect value={typeId} onChange={(event) => changeType(event.target.value)} disabled={(editing && !(asset?.dataOrigin === 'FIELD_SURVEY' && asset.informationStatus === 'DRAFT')) || !canEdit} required><option value="">Seleccionar…</option>{types.filter((type) => type.isActive || type.id === typeId).map((type) => <option key={type.id} value={type.id}>{type.name}</option>)}</SearchableSelect></label><div className="field parent-picker"><span>Registro padre {!selectedType?.canBeRoot && <em>obligatorio</em>}</span><input className="parent-search" value={parentSearch} onChange={(event) => setParentSearch(event.target.value)} disabled={!canEdit || !canDirectContextEdit} placeholder="Buscar planta, batería, estación…" /><SearchableSelect value={parentId} onChange={(event) => { setParentId(event.target.value); setParentSearch(''); }} disabled={!canEdit || !canDirectContextEdit} required={!selectedType?.canBeRoot}><option value="">{selectedType?.canBeRoot ? 'Sin padre · registro raíz' : 'Seleccionar registro padre…'}</option>{parents.map((parent) => <option key={parent.id} value={parent.id}>{parent.name} · {parent.code} ({parent.type.name})</option>)}</SearchableSelect><small>Escribí para buscar entre los registros compatibles.</small></div></div><div className="form-grid">{canChangeStatus && <label className="field"><span>Estado del dato</span><SearchableSelect value={status} onChange={(event) => setStatus(event.target.value as AssetInformationStatus)} disabled={!canEdit && !canChangeStatus}>{ASSET_STATUSES.map((item) => <option key={item.value} value={item.value}>{item.label}</option>)}</SearchableSelect><small>Calidad y validación del registro.</small></label>}{editing && canChangeOperationalStatus && <label className="field"><span>Estado operativo</span><SearchableSelect value={operationalStatus} onChange={(event) => setOperationalStatus(event.target.value as AssetOperationalStatus)}>{ASSET_OPERATIONAL_STATUSES.map((item) => <option key={item.value} value={item.value}>{item.label}</option>)}</SearchableSelect><small>Situación física u operativa del elemento.</small></label>}</div></div>
+        <div className="form-section"><div><h2>Ubicación en la estructura</h2><p className="section-copy">Elegí qué es y dónde está contenido. La ubicación física es independiente de la Operadora del Área. Los registros ya consolidados cambian de ubicación desde el bloque histórico inferior.</p></div><div className="form-grid"><label className="field"><span>Tipo de elemento</span><SearchableSelect value={typeId} onChange={(event) => changeType(event.target.value)} disabled={(editing && !(asset?.dataOrigin === 'FIELD_SURVEY' && asset.informationStatus === 'DRAFT')) || !canEdit} required><option value="">Seleccionar…</option>{types.filter((type) => type.isActive || type.id === typeId).map((type) => <option key={type.id} value={type.id}>{type.name}</option>)}</SearchableSelect></label><div className="field parent-picker"><span>Registro padre {!selectedType?.canBeRoot && <em>obligatorio</em>}</span><input className="parent-search" value={parentSearch} onChange={(event) => setParentSearch(event.target.value)} disabled={!canEdit || !canDirectContextEdit} placeholder="Buscar planta, batería, estación…" /><SearchableSelect value={parentId} onChange={(event) => { setParentId(event.target.value); setParentSearch(''); }} disabled={!canEdit || !canDirectContextEdit} required={!selectedType?.canBeRoot}><option value="">{selectedType?.canBeRoot ? 'Sin padre · registro raíz' : 'Seleccionar registro padre…'}</option>{parents.map((parent) => <option key={parent.id} value={parent.id}>{parent.name} · {parent.code} ({parent.type.name})</option>)}</SearchableSelect><small>Escribí para buscar entre los registros compatibles.</small></div></div><div className="form-grid">{canChangeStatus && <label className="field"><span>Estado del dato</span><SearchableSelect value={status} onChange={(event) => setStatus(event.target.value as AssetInformationStatus)} disabled={!canEdit && !canChangeStatus}>{ASSET_STATUSES.map((item) => <option key={item.value} value={item.value}>{item.label}</option>)}</SearchableSelect><small>Calidad y validación del registro.</small></label>}{editing && canChangeOperationalStatus && <label className="field"><span>Estado operativo</span><SearchableSelect value={operationalStatus} onChange={(event) => setOperationalStatus(event.target.value as AssetOperationalStatus)}>{ASSET_OPERATIONAL_STATUSES.map((item) => <option key={item.value} value={item.value}>{item.label}</option>)}</SearchableSelect><small>Situación física u operativa del elemento.</small></label>}</div></div>
 
-        {selectedType?.operationalRole === 'GENERIC' && canReadRelations && <div className="form-section"><div><h2>Área y operadora</h2><p className="section-copy">Sólo necesitás revisar estos campos. La jerarquía física sigue siendo independiente.</p></div><div className="form-grid"><label className="field"><span>Área</span><SearchableSelect value={operationalAreaId} onChange={(event) => { setOperationalAreaId(event.target.value); setOperatorCompanyId(''); }} disabled={!canEdit || !canDirectContextEdit}><option value="">Sin asignación operativa</option>{operationalAreas.map((area) => <option key={area.id} value={area.id}>{area.name}</option>)}</SearchableSelect></label><label className="field"><span>Operadora {operationalAreaId && <em>obligatoria</em>}</span><SearchableSelect value={operatorCompanyId} onChange={(event) => setOperatorCompanyId(event.target.value)} disabled={!canEdit || !canDirectContextEdit || !operationalAreaId} required={Boolean(operationalAreaId)}><option value="">{operationalAreaId ? 'Seleccionar operadora…' : 'Primero seleccioná un área'}</option>{operationalCompanies.map((company) => <option key={company.id} value={company.id}>{company.name}</option>)}</SearchableSelect></label></div>{operationalAreaId && operatorCompanyId && <div className="temporal-notice"><Icon name="check" /><p><strong>Contexto confirmado.</strong> El registro pertenece a esta Área y tiene una única Operadora activa.</p></div>}</div>}
+        {selectedType?.operationalRole === 'GENERIC' && canReadRelations && <div className="form-section"><div><h2>{editing ? 'Área física' : 'Área y operadora al alta'}</h2><p className="section-copy">{editing ? 'El Inventario pertenece físicamente al Área. La Operadora vigente se administra en las relaciones temporales del Área y no se reescribe dentro del Inventario.' : 'Al crear el registro, la Operadora activa del Área queda guardada únicamente como snapshot histórico de alta.'}</p></div><div className="form-grid"><label className="field"><span>Área</span><SearchableSelect value={operationalAreaId} onChange={(event) => { setOperationalAreaId(event.target.value); if (!editing) setOperatorCompanyId(''); }} disabled={!canEdit || !canDirectContextEdit}><option value="">Sin asignación operativa</option>{operationalAreas.map((area) => <option key={area.id} value={area.id}>{area.name}</option>)}</SearchableSelect>{editing && <small>La Operadora se resuelve por la relación Área↔Empresa vigente.</small>}</label>{!editing && <label className="field"><span>Operadora {operationalAreaId && <em>obligatoria</em>}</span><SearchableSelect value={operatorCompanyId} onChange={(event) => setOperatorCompanyId(event.target.value)} disabled={!canEdit || !operationalAreaId} required={Boolean(operationalAreaId)}><option value="">{operationalAreaId ? 'Seleccionar operadora…' : 'Primero seleccioná un área'}</option>{operationalCompanies.map((company) => <option key={company.id} value={company.id}>{company.name}</option>)}</SearchableSelect></label>}</div>{!editing && operationalAreaId && operatorCompanyId && <div className="temporal-notice"><Icon name="check" /><p><strong>Contexto de alta confirmado.</strong> La Operadora seleccionada se conservará como referencia histórica; futuros cambios se harán en la relación temporal del Área.</p></div>}{editing && asset?.operatorCompany && <div className="temporal-notice"><Icon name="layers" /><p><strong>Snapshot histórico de alta:</strong> {asset.operatorCompany.name}. No se modifica desde este registro.</p></div>}</div>}
 
         <div className="form-section"><div><h2>Datos técnicos</h2><p className="section-copy">Campos definidos para el tipo seleccionado.</p></div>{definitions.length === 0 ? <div className="inline-empty">Este tipo no requiere datos técnicos adicionales.</div> : <div className="dynamic-attributes">{definitions.map((definition) => { const value = attributeValues[definition.id]; const label = <span>{definition.name}{definition.unit ? ` (${definition.unit})` : ''}{definition.isRequired ? <em>obligatorio</em> : <em>opcional</em>}</span>; if (definition.dataType === 'BOOLEAN') return <label className="check-row attribute-check" key={definition.id}><input type="checkbox" checked={Boolean(value)} onChange={(event) => setAttribute(definition.id, event.target.checked)} disabled={!canEdit} /><span><strong>{definition.name}</strong><small>{definition.code}</small></span></label>; if (definition.dataType === 'SELECT') return <label className="field" key={definition.id}>{label}<SearchableSelect value={String(value ?? '')} onChange={(event) => setAttribute(definition.id, event.target.value)} disabled={!canEdit} required={definition.isRequired}><option value="">Seleccionar…</option>{definition.options?.map((option) => <option key={option} value={option}>{option}</option>)}</SearchableSelect></label>; const inputType = definition.dataType === 'NUMBER' ? 'number' : definition.dataType === 'DATE' ? 'date' : definition.dataType === 'DATETIME' ? 'datetime-local' : 'text'; return <label className="field" key={definition.id}>{label}<input type={inputType} value={String(value ?? '')} onChange={(event) => setAttribute(definition.id, event.target.value)} disabled={!canEdit} required={definition.isRequired} step={definition.dataType === 'NUMBER' ? 'any' : undefined} maxLength={definition.dataType === 'TEXT' ? 4000 : undefined} /></label>; })}</div>}</div>
         {canSave && <div className="form-actions"><Link className="button secondary" to="/inventarios">Cancelar</Link><button className="button primary" disabled={saving}><Icon name="check" />{saving ? 'Guardando…' : editing && !canEdit ? 'Actualizar estado' : editing ? 'Guardar cambios' : 'Crear registro'}</button></div>}