Merge pull request #6008 from defrance/patch-44

if supplier have multiple price return it several times

htdocs/product/class/product.class.php

@@ -2794,7 +2794,7 @@ class Product extends CommonObject
 
 		$list = array();
 
-		$sql = "SELECT p.fk_soc";
+		$sql = "SELECT DISTINCT p.fk_soc";
 		$sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur_price as p";
 		$sql.= " WHERE p.fk_product = ".$this->id;
 		$sql.= " AND p.entity = ".$conf->entity;