diff --git a/addons/web/static/src/js/views/basic/basic_model.js b/addons/web/static/src/js/views/basic/basic_model.js
index 99bf22cc6bd..82bb9e586a8 100644
--- a/addons/web/static/src/js/views/basic/basic_model.js
+++ b/addons/web/static/src/js/views/basic/basic_model.js
@@ -2578,6 +2578,11 @@ var BasicModel = AbstractModel.extend({
                     relationField: field.relation_field,
                     viewType: view ? view.type : fieldInfo.viewType,
                 });
+                // set existing changes to the list
+                if (record._changes && record._changes[fieldName]) {
+                    list._changes = self.localData[record._changes[fieldName]]._changes;
+                    record._changes[fieldName] = list.id;
+                }
                 record.data[fieldName] = list.id;
                 if (!fieldInfo.__no_fetch) {
                     var def = self._readUngroupedList(list).then(function () {
diff --git a/addons/web/static/tests/fields/relational_fields_tests.js b/addons/web/static/tests/fields/relational_fields_tests.js
index 753e62ad02c..f11da4d323a 100644
--- a/addons/web/static/tests/fields/relational_fields_tests.js
+++ b/addons/web/static/tests/fields/relational_fields_tests.js
@@ -143,10 +143,12 @@ QUnit.module('relational_fields', {
             user: {
                 fields: {
                     name: {string: "Name", type: "char"},
+                    partner_ids: {string: "one2many partners field", type: "one2many", relation: 'partner', relation_field: 'user_id'},
                 },
                 records: [{
                     id: 17,
                     name: "Aline",
+                    partner_ids: [1, 2],
                 }, {
                     id: 19,
                     name: "Christine",
@@ -9383,6 +9385,94 @@ QUnit.module('relational_fields', {
         form.destroy();
     });
 
+    QUnit.test('onchange affecting inline unopened list view', function (assert) {
+        // when we got onchange result for fields of record that were not
+        // already available because they were in a inline view not already
+        // opened, in a given configuration the change were applied ignoring
+        // existing data, thus a line of a one2many field inside a one2many
+        // field could be duplicated unexplectedly
+        assert.expect(5);
+
+        var numUserOnchange = 0;
+
+        this.data.user.onchanges = {
+            partner_ids: function (obj) {
+                if (numUserOnchange === 0) {
+                    // simulate proper server onchange after save of modal with new record
+                    obj.partner_ids = [
+                        [5],
+                        [1, 1, {
+                            display_name: 'first record',
+                            turtles: [
+                                [5],
+                                [1, 2, {'display_name': 'donatello'}],
+                            ],
+                        }],
+                        [1, 2, {
+                            display_name: 'second record',
+                            turtles: [
+                                [5],
+                                obj.partner_ids[1][2].turtles[0],
+                            ],
+                        }],
+                    ];
+                }
+                numUserOnchange++;
+            },
+        };
+
+        var form = createView({
+            View: FormView,
+            model: 'user',
+            data: this.data,
+            arch: '<form><sheet><group>' +
+                      '<field name="partner_ids">' +
+                          '<form>'+
+                              '<field name="turtles">' +
+                                  '<tree editable="bottom">' +
+                                      '<field name="display_name"/>' +
+                                  '</tree>' +
+                              '</field>' +
+                          '</form>' +
+                          '<tree>' +
+                              '<field name="display_name"/>' +
+                          '</tree>' +
+                      '</field>' +
+                  '</group></sheet></form>',
+            res_id: 17,
+        });
+
+        // add a turtle on second partner
+        form.$buttons.find('.o_form_button_edit').click();
+        form.$('.o_data_row:eq(1)').click();
+        $('.modal .o_field_x2many_list_row_add a').click();
+        $('.modal input[name="display_name"]').val('michelangelo').change();
+        $('.modal .btn-primary').click();
+        // open first partner so changes from previous action are applied
+        form.$('.o_data_row:eq(0)').click();
+        $('.modal .btn-primary').click();
+        form.$buttons.find('.o_form_button_save').click();
+
+        assert.strictEqual(numUserOnchange, 2,
+            'there should 2 and only 2 onchange from closing the partner modal');
+
+        form.$('.o_data_row:eq(0)').click();
+        assert.strictEqual($('.modal .o_data_row').length, 1,
+            'only 1 turtle for first partner');
+        assert.strictEqual($('.modal .o_data_row').text(), 'donatello',
+            'first partner turtle is donatello');
+        $('.modal .o_form_button_cancel').click();
+
+        form.$('.o_data_row:eq(1)').click();
+        assert.strictEqual($('.modal .o_data_row').length, 1,
+            'only 1 turtle for second partner');
+        assert.strictEqual($('.modal .o_data_row').text(), 'michelangelo',
+            'second partner turtle is michelangelo');
+        $('.modal .o_form_button_cancel').click();
+
+        form.destroy();
+    });
+
     QUnit.module('FieldMany2Many');
 
     QUnit.test('many2many kanban: edition', function (assert) {