diff --git a/src/GridFieldOrderableRows.php b/src/GridFieldOrderableRows.php
index 1003c96..56538f0 100755
--- a/src/GridFieldOrderableRows.php
+++ b/src/GridFieldOrderableRows.php
@@ -545,10 +545,8 @@ class GridFieldOrderableRows extends RequestHandler implements
             $sortTable = $this->getSortTable($list);
             $now = DBDatetime::now()->Rfc2822();
             $additionalSQL = '';
-            $baseTable = $sortTable;
-            if (class_exists($sortTable)) {
-                $baseTable = singleton($sortTable)->baseTable();
-            }
+            $baseTable = DataObject::getSchema()->baseDataTable($list->dataClass());
+
             $isBaseTable = ($baseTable == $sortTable);
             if (!$list instanceof ManyManyList && $isBaseTable) {
                 $additionalSQL = ", \"LastEdited\" = '$now'";
@@ -565,7 +563,7 @@ class GridFieldOrderableRows extends RequestHandler implements
                         $this->getSortTableClauseForIds($list, $id)
                     ));
 
-                    if (!$isBaseTable) {
+                    if (!$isBaseTable && !$list instanceof ManyManyList) {
                         DB::query(sprintf(
                             'UPDATE "%s" SET "LastEdited" = \'%s\' WHERE %s',
                             $baseTable,
@@ -600,10 +598,8 @@ class GridFieldOrderableRows extends RequestHandler implements
         $clause = sprintf('"%s"."%s" = 0', $table, $this->getSortField());
         $now = DBDatetime::now()->Rfc2822();
         $additionalSQL = '';
-        $baseTable = $table;
-        if (class_exists($table)) {
-            $baseTable = singleton($table)->baseTable();
-        }
+        $baseTable = DataObject::getSchema()->baseDataTable($list->dataClass());
+
         $isBaseTable = ($baseTable == $table);
         if (!$list instanceof ManyManyList && $isBaseTable) {
             $additionalSQL = ", \"LastEdited\" = '$now'";
@@ -622,7 +618,7 @@ class GridFieldOrderableRows extends RequestHandler implements
                 $this->getSortTableClauseForIds($list, $id)
             ));
 
-            if (!$isBaseTable) {
+            if (!$isBaseTable && !$list instanceof ManyManyList) {
                 DB::query(sprintf(
                     'UPDATE "%s" SET "LastEdited" = \'%s\' WHERE %s',
                     $baseTable,
diff --git a/tests/GridFieldOrderableRowsTest.php b/tests/GridFieldOrderableRowsTest.php
index cc846af..d49674d 100644
--- a/tests/GridFieldOrderableRowsTest.php
+++ b/tests/GridFieldOrderableRowsTest.php
@@ -7,9 +7,11 @@ use SilverStripe\Dev\SapphireTest;
 use SilverStripe\Forms\GridField\GridField;
 use SilverStripe\Forms\GridField\GridFieldConfig_RelationEditor;
 use Symbiote\GridFieldExtensions\GridFieldOrderableRows;
+use Symbiote\GridFieldExtensions\Tests\Stub\StubOrderableChild;
 use Symbiote\GridFieldExtensions\Tests\Stub\StubOrdered;
 use Symbiote\GridFieldExtensions\Tests\Stub\StubParent;
 use Symbiote\GridFieldExtensions\Tests\Stub\StubSubclass;
+use Symbiote\GridFieldExtensions\Tests\Stub\StubUnorderable;
 
 /**
  * Tests for the {@link GridFieldOrderableRows} component.
@@ -21,11 +23,13 @@ class GridFieldOrderableRowsTest extends SapphireTest
 
     protected static $fixture_file = 'GridFieldOrderableRowsTest.yml';
 
-    protected static $extra_dataobjects = array(
+    protected static $extra_dataobjects = [
         StubParent::class,
         StubOrdered::class,
         StubSubclass::class,
-    );
+        StubUnorderable::class,
+        StubOrderableChild::class,
+    ];
 
     public function testReorderItems()
     {
@@ -46,7 +50,7 @@ class GridFieldOrderableRowsTest extends SapphireTest
         );
 
         $originalOrder = $parent->MyManyMany()->sort('ManyManySort')->column('ID');
-        $desiredOrder = array();
+        $desiredOrder = [];
 
         // Make order non-contiguous, and 1-based
         foreach (array_reverse($originalOrder) as $index => $id) {
@@ -62,8 +66,38 @@ class GridFieldOrderableRowsTest extends SapphireTest
         $this->assertEquals($desiredOrder, $newOrder);
     }
 
+    public function testSortableChildClass()
+    {
+        $orderable = new GridFieldOrderableRows('Sort');
+        $reflection = new ReflectionMethod($orderable, 'executeReorder');
+        $reflection->setAccessible(true);
+
+        $parent = $this->objFromFixture(StubOrdered::class, 'nestedtest');
+
+        $config = new GridFieldConfig_RelationEditor();
+        $config->addComponent($orderable);
+
+        $grid = new GridField(
+            'Children',
+            'Children',
+            $parent->Children(),
+            $config
+        );
+
+        $originalOrder = $parent->Children()->column('ID');
+        $desiredOrder = array_reverse($originalOrder);
+
+        $this->assertNotEquals($originalOrder, $desiredOrder);
+
+        $reflection->invoke($orderable, $grid, $desiredOrder);
+
+        $newOrder = $parent->Children()->column('ID');
+
+        $this->assertEquals($desiredOrder, $newOrder);
+    }
+
     /**
-     * @covers GridFieldOrderableRows::getSortTable
+     * @covers \Symbiote\GridFieldExtensions\GridFieldOrderableRows::getSortTable
      */
     public function testGetSortTable()
     {
diff --git a/tests/GridFieldOrderableRowsTest.yml b/tests/GridFieldOrderableRowsTest.yml
index c40f34c..20d5c34 100644
--- a/tests/GridFieldOrderableRowsTest.yml
+++ b/tests/GridFieldOrderableRowsTest.yml
@@ -1,3 +1,12 @@
+Symbiote\GridFieldExtensions\Tests\Stub\StubOrderableChild:
+  item1:
+    Sort: 1
+  item2:
+    Sort: 2
+  item3:
+    Sort: 3
+  item4:
+    Sort: 4
 Symbiote\GridFieldExtensions\Tests\Stub\StubOrdered:
   item1:
     Sort: 1
@@ -11,7 +20,8 @@ Symbiote\GridFieldExtensions\Tests\Stub\StubOrdered:
     Sort: 5
   item6:
     Sort: 6
-
+  nestedtest:
+    Children: =>Symbiote\GridFieldExtensions\Tests\Stub\StubOrderableChild.item1,=>Symbiote\GridFieldExtensions\Tests\Stub\StubOrderableChild.item2,=>Symbiote\GridFieldExtensions\Tests\Stub\StubOrderableChild.item3,=>Symbiote\GridFieldExtensions\Tests\Stub\StubOrderableChild.item4
 Symbiote\GridFieldExtensions\Tests\Stub\StubParent:
   parent:
     MyManyMany:
diff --git a/tests/Stub/StubOrderableChild.php b/tests/Stub/StubOrderableChild.php
new file mode 100644
index 0000000..890ac9a
--- /dev/null
+++ b/tests/Stub/StubOrderableChild.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Symbiote\GridFieldExtensions\Tests\Stub;
+
+class StubOrderableChild extends StubUnorderable
+{
+    private static $db = [
+        'Sort' => 'Int',
+    ];
+
+    private static $has_one = [
+        'Parent' => StubOrdered::class,
+    ];
+
+    private static $default_sort = '"Sort" ASC';
+
+    private static $table_name = 'StubOrderableChild';
+}
diff --git a/tests/Stub/StubOrdered.php b/tests/Stub/StubOrdered.php
index e333864..b764ba5 100644
--- a/tests/Stub/StubOrdered.php
+++ b/tests/Stub/StubOrdered.php
@@ -15,6 +15,10 @@ class StubOrdered extends DataObject implements TestOnly
         'Parent' => StubParent::class
     );
 
+    private static $has_many = array(
+        'Children' => StubOrderableChild::class,
+    );
+
     private static $belongs_many_many =array(
         'MyManyMany' => StubParent::class,
     );
diff --git a/tests/Stub/StubUnorderable.php b/tests/Stub/StubUnorderable.php
new file mode 100644
index 0000000..a1969ab
--- /dev/null
+++ b/tests/Stub/StubUnorderable.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Symbiote\GridFieldExtensions\Tests\Stub;
+
+use SilverStripe\Dev\TestOnly;
+use SilverStripe\ORM\DataObject;
+
+class StubUnorderable extends DataObject implements TestOnly
+{
+    private static $db = [
+        'Title' => 'Varchar',
+    ];
+
+    private static $table_name = 'StubUnorderable';
+}