Fix DDC-1787.

Credit goes to Jack van Galen for fixing this issue.
Fix for JoinedSubclassPersister, multiple inserts with versioning throws
an optimistic locking exception.

lib/Doctrine/ORM/Persisters/JoinedSubclassPersister.php

@@ -181,6 +181,10 @@ public function executeInserts()
                 $id = $this->em->getUnitOfWork()->getEntityIdentifier($entity);
             }
 
+            if ($this->class->isVersioned) {
+                $this->assignDefaultVersionValue($entity, $id);
+            }
+
             // Execute inserts on subtables.
             // The order doesn't matter because all child tables link to the root table via FK.
             foreach ($subTableStmts as $tableName => $stmt) {
@@ -212,10 +216,6 @@ public function executeInserts()
             $stmt->closeCursor();
         }
 
-        if ($this->class->isVersioned) {
-            $this->assignDefaultVersionValue($entity, $id);
-        }
-
         $this->queuedInserts = array();
 
         return $postInsertIds;