diff --git a/htdocs/product/class/api_products.class.php b/htdocs/product/class/api_products.class.php
index 91edbe5eaff..ec735da3865 100644
--- a/htdocs/product/class/api_products.class.php
+++ b/htdocs/product/class/api_products.class.php
@@ -479,7 +479,7 @@ class Products extends DolibarrApi
 
 		$childsArbo = $this->product->getChildsArbo($id, 1);
 
-		$keys = array('rowid', 'qty', 'fk_product_type', 'label', 'incdec', 'ref');
+		$keys = array('rowid', 'qty', 'fk_product_type', 'label', 'incdec', 'ref', 'fk_association', 'rang');
 		$childs = array();
 		foreach ($childsArbo as $values) {
 			$childs[] = array_combine($keys, $values);
@@ -2049,7 +2049,7 @@ class Products extends DolibarrApi
 		if ($includesubproducts) {
 			$childsArbo = $this->product->getChildsArbo($id, 1);
 
-			$keys = array('rowid', 'qty', 'fk_product_type', 'label', 'incdec');
+			$keys = array('rowid', 'qty', 'fk_product_type', 'label', 'incdec', 'ref', 'fk_association', 'rang');
 			$childs = array();
 			foreach ($childsArbo as $values) {
 				$childs[] = array_combine($keys, $values);