diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 1cce0c38772..4a65754e975 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -5154,7 +5154,7 @@ function get_default_tva(Societe $thirdparty_seller, Societe $thirdparty_buyer,
 	$buyer_country_code = $thirdparty_buyer->country_code;
 	$buyer_in_cee = isInEEC($thirdparty_buyer);
 
-	dol_syslog("get_default_tva: seller use vat=".$seller_use_vat.", seller country=".$seller_country_code.", seller in cee=".$seller_in_cee.", buyer country=".$buyer_country_code.", buyer in cee=".$buyer_in_cee.", idprod=".$idprod.", idprodfournprice=".$idprodfournprice.", SERVICE_ARE_ECOMMERCE_200238EC=".(! empty($conf->global->SERVICES_ARE_ECOMMERCE_200238EC)?$conf->global->SERVICES_ARE_ECOMMERCE_200238EC:''));
+	dol_syslog("get_default_tva: seller use vat=".$seller_use_vat.", seller country=".$seller_country_code.", seller in cee=".$seller_in_cee.", buyer vat number=".$thirdparty_buyer->tva_intra." buyer country=".$buyer_country_code.", buyer in cee=".$buyer_in_cee.", idprod=".$idprod.", idprodfournprice=".$idprodfournprice.", SERVICE_ARE_ECOMMERCE_200238EC=".(! empty($conf->global->SERVICES_ARE_ECOMMERCE_200238EC)?$conf->global->SERVICES_ARE_ECOMMERCE_200238EC:''));
 
 	// If services are eServices according to EU Council Directive 2002/38/EC (http://ec.europa.eu/taxation_customs/taxation/vat/traders/e-commerce/article_1610_en.htm)
 	// we use the buyer VAT.