=== modified file 'dhis-2/dhis-web/dhis-web-dataentry/src/main/webapp/dhis-web-dataentry/javascript/entry.js'
--- dhis-2/dhis-web/dhis-web-dataentry/src/main/webapp/dhis-web-dataentry/javascript/entry.js	2013-08-12 19:34:06 +0000
+++ dhis-2/dhis-web/dhis-web-dataentry/src/main/webapp/dhis-web-dataentry/javascript/entry.js	2013-08-12 19:58:08 +0000
@@ -230,7 +230,9 @@
 {
     fieldId = '#' + fieldId;
 
-    var value = $( fieldId ).attr( 'checked' );
+    var value = $( fieldId ).is( ':checked' );
+    
+    value = ( value ==  true) ? value : undefined; // Send nothing if un-ticked
 
     $( fieldId ).css( 'background-color', COLOR_YELLOW );