--- FeedsTermProcessor.inc	2011-02-09 12:14:33.399725253 +0300
+++ FeedsTermProcessor_new.inc	2011-02-09 12:15:16.859725253 +0300
@@ -223,6 +223,12 @@ class FeedsTermProcessor extends FeedsPr
           return $tid;
         }
       }
+      if ($target == 'external_id') {
+        $vocabulary = $this->vocabulary();
+        if ($tid = db_result(db_query("SELECT td.tid FROM {term_data} td INNER JOIN {term_geo} tg ON td.tid = tg.tid WHERE tg.external_id = '%s' AND td.vid = %d", $value, $vocabulary->vid))) {
+          return $tid;
+        }
+      }
     }
     return 0;
   }