diff --git a/plasmid/source/core-plugins/petermigration/1/dss/drop-boxes/petermigration/migration.py b/plasmid/source/core-plugins/petermigration/1/dss/drop-boxes/petermigration/migration.py
index d8490c2059cb1986d07afc23fb68cdecd539bd1b..3bd8b0f3925040e27dd7b04c7234ff96af8134ce 100644
--- a/plasmid/source/core-plugins/petermigration/1/dss/drop-boxes/petermigration/migration.py
+++ b/plasmid/source/core-plugins/petermigration/1/dss/drop-boxes/petermigration/migration.py
@@ -368,9 +368,8 @@ class DocumentOpenBISDTO(OpenBISDTO):
             return None
     
     def isInOpenBIS(self, tr):
-        return False
-        #dataset = self.getDocumentBySerial(tr, self.values["SERIAL"])
-        #return dataset is not None
+        dataset = self.getDocumentBySerial(tr, self.values["SERIAL"])
+        return dataset is not None
         
 fmConnString = "jdbc:filemaker://127.0.0.1/"
 fmUser = "designer"