diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9a04c74..dddcb6bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fix relation (`CommonDBRelation`) insertion
 - Fix default entity insertion for a user
 - Fixed `SQL` error when creating new injection model
 
diff --git a/inc/commoninjectionlib.class.php b/inc/commoninjectionlib.class.php
index 86513b8f..07f00a98 100644
--- a/inc/commoninjectionlib.class.php
+++ b/inc/commoninjectionlib.class.php
@@ -1645,7 +1645,7 @@ private function effectiveAddOrUpdate($injectionClass, $item, $values, $add = tr
             //CommonDBRelation are managed separately, so related field should be ignored
             // Ex : User -> groups_id -> Group_User
             // groups_id should not be injected in User (field contains group name (string))
-            if ($option !== false && isset($option['displaytype']) && $option['displaytype'] == 'relation') {
+            if ($option !== false && isset($option['displaytype']) && $option['displaytype'] == 'relation' && !($item instanceof CommonDBRelation)) {
                 continue;
             }