diff --git a/app/templates/automation.html b/app/templates/automation.html
index ea3273e..93e7496 100644
--- a/app/templates/automation.html
+++ b/app/templates/automation.html
@@ -364,6 +364,14 @@ async function previewAutomation() {
       psSection.classList.add('hidden');
     }
 
+    // Ventas - errores de generación
+    if (data.ventas_gen_errors && data.ventas_gen_errors.length > 0) {
+      data.ventas_gen_errors.forEach(e => {
+        showToast(`Error generando venta ${e.factura}: ${e.error}`, 'error');
+        console.error('ventas_gen_error', e);
+      });
+    }
+
     // Ventas
     const vtaSection = document.getElementById('ventas-section');
     if (_pasos.has('ventas') && data.ventas_preview && data.ventas_preview.length > 0) {