diff --git a/source/static/js/controller/invoices.js b/source/static/js/controller/invoices.js
index dbefa83..d4af9dd 100644
--- a/source/static/js/controller/invoices.js
+++ b/source/static/js/controller/invoices.js
@@ -1079,6 +1079,16 @@ function grid_details_before_edit_stop(state, editor){
         }
         var cantidad = parseFloat(row['cantidad'])
         var valor_unitario = parseFloat(row['valor_unitario'])
+
+        if(descuento>=valor_unitario){
+            msg = 'El descuento debe ser menor al Valor Unitario'
+            msg_error(msg)
+            grid.blockEvent()
+            state.value = state.old
+            grid.editCancel()
+            grid.unblockEvent()
+            return true
+        }
     }
 
     var precio_final = valor_unitario - descuento