diff --git a/addons/web/static/src/js/views/form_relational_widgets.js b/addons/web/static/src/js/views/form_relational_widgets.js
index ce382f22064..1874527d82a 100644
--- a/addons/web/static/src/js/views/form_relational_widgets.js
+++ b/addons/web/static/src/js/views/form_relational_widgets.js
@@ -513,7 +513,7 @@ var AbstractManyField = common.AbstractField.extend({
         this.set('value', []);
         this.starting_ids = [];
         this.view.on("load_record", this, function () {
-            self.starting_ids = self.get('value');
+            self.starting_ids = self.get('value').slice();
         });
         this.dataset.on('dataset_changed', this, function() {
             // the editable lists change the dataset without call AbstractManyField methods