=== modified file 'dhis-2/dhis-api/src/main/java/org/hisp/dhis/schema/Property.java'
--- dhis-2/dhis-api/src/main/java/org/hisp/dhis/schema/Property.java	2015-02-20 03:59:30 +0000
+++ dhis-2/dhis-api/src/main/java/org/hisp/dhis/schema/Property.java	2015-02-25 08:23:37 +0000
@@ -211,6 +211,7 @@
         this.setterMethod = setter;
     }
 
+    @Override
     @JsonProperty
     @JacksonXmlProperty( namespace = DxfNamespaces.DXF_2_0 )
     public Class<?> getKlass()

=== modified file 'dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/events/enrollment/AbstractEnrollmentService.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/events/enrollment/AbstractEnrollmentService.java	2015-02-20 12:35:55 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/events/enrollment/AbstractEnrollmentService.java	2015-02-25 08:23:37 +0000
@@ -352,6 +352,22 @@
             return importSummary;
         }
 
+        if ( program.getOnlyEnrollOnce() )
+        {
+            enrollments = getEnrollments( program, trackedEntityInstance, EnrollmentStatus.COMPLETED );
+
+            if ( !enrollments.getEnrollments().isEmpty() )
+            {
+                importSummary.setStatus( ImportStatus.ERROR );
+                importSummary.setDescription( "TrackedEntityInstance " + trackedEntityInstance.getTrackedEntityInstance()
+                    + " already have a completed enrollment in program " + program.getUid() + ", and this program is" +
+                    " configured to only allow enrolling one time." );
+                importSummary.getImportCount().incrementIgnored();
+
+                return importSummary;
+            }
+        }
+
         List<ImportConflict> importConflicts = new ArrayList<>();
         importConflicts.addAll( checkAttributes( enrollment ) );