=== modified file 'dhis-2/dhis-api/src/main/java/org/hisp/dhis/program/Program.java'
--- dhis-2/dhis-api/src/main/java/org/hisp/dhis/program/Program.java	2013-12-18 16:24:12 +0000
+++ dhis-2/dhis-api/src/main/java/org/hisp/dhis/program/Program.java	2013-12-18 16:24:45 +0000
@@ -368,7 +368,6 @@
     }
 
     @JsonProperty(value = "identifierTypes")
-    @JsonSerialize(contentAs = BaseIdentifiableObject.class)
     @JsonView({ DetailedView.class, ExportView.class, WithoutOrganisationUnitsView.class })
     @JacksonXmlElementWrapper(localName = "identifierTypes", namespace = DxfNamespaces.DXF_2_0)
     @JacksonXmlProperty(localName = "identifierType", namespace = DxfNamespaces.DXF_2_0)