fix : The property am does not seem to exist on Tva

htdocs/compta/paiement_vat.php

@@ -290,7 +290,7 @@ if ($action == 'create') {
 		print "</tr>\n";
 		$total += $objp->total;
 		$total_ttc += $objp->total_ttc;
-		$totalrecu += $objp->am;
+		$totalrecu += $objp->amount;
 		$i++;
 	}
 	if ($i > 1) {