Index: taxonomy.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/feeds/mappers/taxonomy.inc,v
retrieving revision 1.1
diff -u -r1.1 taxonomy.inc
--- taxonomy.inc	5 Dec 2009 01:38:27 -0000	1.1
+++ taxonomy.inc	27 Mar 2010 13:21:04 -0000
@@ -50,6 +50,13 @@
   $vocab_id = (int) str_replace('taxonomy:', '', $key);
   $vocab = taxonomy_vocabulary_load($vocab_id);
 
+  // Remove target vocabulary terms from node before adding new ones
+  foreach ($node->taxonomy as $term) {
+    if ($term->vid == $vocab->vid) {
+      unset($node->taxonomy[$term->tid]);
+    }
+  }
+
   // Cast a given single string to an array so we can use it.
   if (!is_array($terms)) {
     $terms = array($terms);