diff --git a/htdocs/commande/class/api_orders.class.php b/htdocs/commande/class/api_orders.class.php
index 71a26eea698..2f4eb6ea996 100644
--- a/htdocs/commande/class/api_orders.class.php
+++ b/htdocs/commande/class/api_orders.class.php
@@ -623,6 +623,12 @@ class Orders extends DolibarrApi
 			throw new RestException(400, 'Error while updating availability');
 		}
 
+        // Update demand reason
+        if (!empty($this->commande->demand_reason_id) && $this->commande->demand_reason_id > 0) {
+            if ($this->commande->demand_reason($this->commande->demand_reason_id) < 0)
+                throw new RestException(400, 'Error while updating demand reason');
+        }
+
 		if ($this->commande->update(DolibarrApiAccess::$user) > 0)
 		{
 			return $this->get($id);