diff --git a/tienda_ilusion/don_confiao/static/js/add_line.js b/tienda_ilusion/don_confiao/static/js/add_line.js
index aed4bec..4f6bc25 100644
--- a/tienda_ilusion/don_confiao/static/js/add_line.js
+++ b/tienda_ilusion/don_confiao/static/js/add_line.js
@@ -1,18 +1,29 @@
 document.addEventListener('DOMContentLoaded', function(){
   var button = document.getElementById('add_line');
   var formContainer = document.getElementById('formset-container');
-  var totalForms = document.getElementById('id_form-TOTAL_FORMS');
+  var totalForms = document.getElementById('id_saleline_set-TOTAL_FORMS');
   button.addEventListener('click', function(){
-    // Clonar un formulario vacío
     var newForm = formContainer.querySelector('.form-container').cloneNode(true);
-    // Obtener el número actual de formularios
     var formCount = parseInt(totalForms.value);
-    // Actualizar los atributos de los nuevos campos del formulario
     var regex = new RegExp('__prefix__', 'g');
     newForm.innerHTML = newForm.innerHTML.replace(regex, formCount);
-    // Añadir el nuevo formulario al contenedor
+
+    var fields = newForm.querySelectorAll('[id^="id_saleline_set-"], [name^="saleline_set-"]');
+    fields.forEach(function(field) {
+      var oldId = field.id;
+      var oldName = field.name;
+
+      if (oldId) {
+        var newId = oldId.replace(/-\d+-/, '-' + formCount + '-');
+        field.id = newId;
+      }
+      if (oldName) {
+        var newName = oldName.replace(/-\d+-/, '-' + formCount + '-');
+        field.name = newName;
+      }
+    });
+
     formContainer.appendChild(newForm);
-    // Incrementar el total de formularios
     totalForms.value = formCount + 1;
   });
 });
diff --git a/tienda_ilusion/don_confiao/templates/don_confiao/purchase.html b/tienda_ilusion/don_confiao/templates/don_confiao/purchase.html
index 7f6c8d9..d174357 100644
--- a/tienda_ilusion/don_confiao/templates/don_confiao/purchase.html
+++ b/tienda_ilusion/don_confiao/templates/don_confiao/purchase.html
@@ -13,7 +13,7 @@
       </div>
     {% endfor %}
   </div>
-  <button id="add_line">Añadir Linea</button>
+  <button id="add_line" type="button" onclick="add_line">Añadir Linea</button>
   <br/><button name="form" type="submit" >Comprar</button>
   <script src="{% static 'js/add_line.js' %}"></script>
 </form>