diff --git a/field_collection.install b/field_collection.install
index 91edfbb..c310bd6 100644
--- a/field_collection.install
+++ b/field_collection.install
@@ -281,3 +281,79 @@ function field_collection_update_7004() {
     }
   }
 }
+
+/**
+ * Copy field_collection_items that are used by multiple entities.
+ **/
+function field_collection_update_7005() {
+  // 1. Find all fields of type field_collection.
+  // 2. Find all items that are used by multiple host-entities
+  // 3. Make copies of the items:
+  //  a) host entities pointing to the newest revision can keep them. (assume that no revision is reused)
+  //  b) if the specific revision doesn't exit anymore copy the current revision instead
+  $result = db_query('SELECT field_name FROM field_config WHERE type=:type', array(':type' => 'field_collection'));
+  foreach ($result as $row) {
+    $name = $row->field_name;
+
+    $sql = <<<SQL
+SELECT f1.{$name}_value AS item_id
+FROM field_data_{$name} f1
+  INNER JOIN field_data_{$name} f2 ON f1.{$name}_value=f2.{$name}_value AND f1.entity_id!=f2.entity_id
+GROUP BY f1.{$name}_value
+SQL;
+
+    foreach (db_query($sql) as $fcid) {
+      if (!($current_fc = field_collection_item_load($fcid->item_id))) {
+        watchdog('field_collection', 'Unable to find field_collection_item with item_id=!item_id', array('!item_id' => $fcid->item_id), WATCHDOG_ERROR);
+        continue;
+      }
+
+      $sql = <<<SQL
+SELECT entity_type, entity_id, delta, {$name}_revision_id AS revision_id FROM field_data_{$name} WHERE {$name}_value=:item_id 
+SQL;
+      foreach (db_query($sql, array(':item_id' => $fcid->item_id)) as $item) {
+        $host_entity = entity_load($item->entity_type, array($item->entity_id));
+        if (!isset($host_entity[$item->entity_id])) {
+          // host entity doesn't exist - never mind.
+          continue;
+        } else {
+          $host_entity = $host_entity[$item->entity_id];
+        }
+
+        if ($item->revision_id == $current_fc->revision_id) {
+          // host entities holding the newest revision can keep them.
+          continue;
+        }
+
+        if (!($fc = field_collection_item_revision_load($item->revision_id))) {
+          // The revision stored in the field-item is not available anymore.
+          // Use the current revision instead.
+          $fc = clone $current_fc;
+          $msg = 'Unable to load revision !revision_id - copying the newest. Data might have been lost.';
+          watchdog('field_collection', $msg, array('!revision_id' => $item->revision_id), WATCHDOG_WARNING);
+        }
+        $fc->is_new = TRUE;
+        $fc->item_id = NULL;
+        $fc->revision_id = NULL;
+        $fc->setHostEntity($item->entity_type, $host_entity, LANGUAGE_NONE, FALSE);
+
+        $host_entity->{$name}[LANGUAGE_NONE][$item->delta] = array(
+          'value' => $fc->item_id,
+          'revision_id' => $fc->revision_id,
+          'entity' => $fc,
+        );
+        entity_save($item->entity_type, $host_entity);
+        $msg = 'Copied item(item_id=!item_id, revision_id=!revision_id) to new item(item_id=!new_item_id, revision_id=!new_revision_id) for entity !entity_type/!entity_id.';
+        $data = array(
+          '!item_id' => $fcid->item_id,
+          '!revision_id' => $item->revision_id,
+          '!new_item_id' => $fc->item_id,
+          '!new_revision_id' => $fc->revision_id,
+          '!entity_type' => $item->entity_type,
+          '!entity_id' => $item->entity_id
+        ); 
+        watchdog('field_collection', $msg, $data, WATCHDOG_INFO);
+      }
+    }
+  }
+}