Fix(Injection): Preserve entities_id if needed

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Fix crash when injection model has no mandatory fields defined
 - Fix models created on parent entities can't be used on child entites
+- Preserve `entities_id`
 
 ## [2.15.4] - 2026-03-16
 

inc/commoninjectionlib.class.php

@@ -1706,6 +1706,10 @@ private function effectiveAddOrUpdate($injectionClass, $item, $values, $add = tr
             if (!$add && $key === 'id') {
                 $toinject[$key] = $value;
             }
+
+            if ($key === 'entities_id') {
+                $toinject[$key] = $value;
+            }
         }
 
         $newID = null;