diff -u field_collection-feeds-1063434-121.patch field_collection-feeds-1063434-152.patch
--- a/field_collection-feeds-1063434-121.patch
+++ b/field_collection-feeds-1063434-152.patch
@@ -1,10 +1,10 @@
-diff --git a/field_collection.module b/field_collection.module
-index 645093a..e1e8390 100644
+diff --git a/field_collection.module" b/field_collection.module
+index c820057..3de727a 100644
 --- a/field_collection.module
 +++ b/field_collection.module
-@@ -1871,3 +1871,144 @@ function field_collection_devel_generate($object, $field, $instance, $bundle) {
- 
-   return array('value' => $field_collection->item_id);
+@@ -1983,3 +1983,153 @@ function field_collection_devel_generate($object, $field, $instance, $bundle) {
+     'revision_id' => $field_collection->revision_id,
+   );
  }
 +
 +/**
@@ -88,6 +88,15 @@ index 645093a..e1e8390 100644
 +    $sub_field_info = field_info_field($sub_field[0]);
 +    if (isset($_sub_targets[$sub_target]['callback']) && function_exists($_sub_targets[$sub_target]['callback'])) {
 +      $callback = $_sub_targets[$sub_target]['callback'];
++      
++      // When updating a reference field that only allows 1 value, the
++      // source value gets appended to the target's existing array of values
++      // and would result in no update being made. To work around this, the 
++      // reference field values and emptied before we continue.
++      if ($sub_field_info['cardinality'] == 1 && $callback == 'references_feeds_set_target') {
++        $field_collection_item->{$sub_field_info['field_name']} = array();
++      }
++      
 +      if($sub_field_info['cardinality'] == 1) {
 +        $callback($source, $field_collection_item, $sub_target, $v, $sub_mapping);
 +      }