diff --git a/web/modules/custom/materio_sapi/src/Controller/Base.php b/web/modules/custom/materio_sapi/src/Controller/Base.php
index 313f291d..614f22ec 100644
--- a/web/modules/custom/materio_sapi/src/Controller/Base.php
+++ b/web/modules/custom/materio_sapi/src/Controller/Base.php
@@ -34,11 +34,13 @@ class Base extends ControllerBase {
 
     // Set fulltext search keywords and fields.
     $this->query->keys($this->keys);
-    // $this->query->setFulltextFields(['name']);
+    // $this->query->setFulltextFields(['field_reference']);
 
     // Set additional conditions.
-    // $this->query->addCondition('status', 1)
-    //   ->addCondition('author', 1, '<>');
+    // in case we search for material reference like W0117
+    if (preg_match('/^[WTRPCMFGSO]\d{4}$/i', $this->keys, $matches)) {
+      $this->query->addCondition('field_reference', $this->keys);
+    }
 
     // Restrict the search to specific languages.
     // $this->query->setLanguages(['de', 'it']);