diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 5c7aba9b253..5a1be24babc 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -7957,7 +7957,7 @@ function get_default_tva(Societe $thirdparty_seller, Societe $thirdparty_buyer,
 	// If the (seller country = buyer country) then the default VAT = VAT of the product sold. End of rule.
 	if (($seller_country_code == $buyer_country_code)
 	|| (in_array($seller_country_code, array('FR', 'MC')) && in_array($buyer_country_code, array('FR', 'MC')))
-	|| (in_array($seller_country_code, array('MQ', 'GP')) && in_array($buyer_country_code, array('MQ', 'GP')))
+	|| (in_array($seller_country_code, array('MQ', 'GP')) && in_array($buyer_country_code, array('MQ', 'GP')))	// We should be able to manage the case of MQ, GP, ... with a deicated vat rate at previous step.
 	) { // Warning ->country_code not always defined
 		//print 'VATRULE 3';
 		$tmpvat = get_product_vat_for_country($idprod, $thirdparty_seller, $idprodfournprice);