diff --git a/items.go b/items.go
index cc1b077..c4bafb7 100644
--- a/items.go
+++ b/items.go
@@ -4,6 +4,7 @@ import (
 	"strconv"
 
 	"github.com/invopop/gobl/bill"
+	"github.com/invopop/gobl/cbc"
 	"github.com/invopop/gobl/i18n"
 	"github.com/invopop/gobl/regimes/it"
 	"github.com/invopop/gobl/tax"
@@ -120,7 +121,7 @@ func findRiferimentoNormativo(rateTotal *tax.RateTotal) string {
 
 	nature := rateTotal.Ext[it.ExtKeySDINature].Code()
 	for _, c := range def.Codes {
-		if c.Code == nature {
+		if c.Code == cbc.Code(nature) {
 			return c.Name[i18n.IT]
 		}
 	}