diff --git a/regimes/co/corrections.go b/regimes/co/corrections.go
index 7ad4124d..960cc10a 100644
--- a/regimes/co/corrections.go
+++ b/regimes/co/corrections.go
@@ -75,9 +75,9 @@ var correctionMethodList = []*tax.KeyDefinition{
 	},
 	{
 		Key: CorrectionMethodKeyOther,
-		Desc: i18n.String{
-			i18n.EN: "Otros.",
-			i18n.ES: "Other.",
+		Name: i18n.String{
+			i18n.EN: "Other",
+			i18n.ES: "Otros",
 		},
 		Map: cbc.CodeMap{
 			KeyDIAN: "5",
diff --git a/regimes/common/invoice_tags.go b/regimes/common/invoice_tags.go
index 2a41f023..66ec8535 100644
--- a/regimes/common/invoice_tags.go
+++ b/regimes/common/invoice_tags.go
@@ -60,6 +60,19 @@ var invoiceTags = []*tax.KeyDefinition{
 			i18n.DE: "Kundensätze",
 		},
 	},
+
+	// Partial invoice document, implying that this is only a first part
+	// and a final invoice for the remaining amount will be made later.
+	// A few regimes use this tag to classify invoices, notably Italy.
+	{
+		Key: tax.TagPartial,
+		Name: i18n.String{
+			i18n.EN: "Partial",
+			i18n.ES: "Parcial",
+			i18n.IT: "Parziale",
+			i18n.DE: "Teilweise",
+		},
+	},
 }
 
 // InvoiceTags returns a list of common invoice tag key
diff --git a/regimes/pt/tax_categories.go b/regimes/pt/tax_categories.go
index 59171fb7..6a0c3f3a 100644
--- a/regimes/pt/tax_categories.go
+++ b/regimes/pt/tax_categories.go
@@ -112,7 +112,11 @@ var taxCategories = []*tax.Category{
 				},
 			},
 			{
-				Key:    tax.RateExempt,
+				Key: tax.RateExempt,
+				Name: i18n.String{
+					i18n.EN: "Exempt",
+					i18n.PT: "Isento",
+				},
 				Exempt: true,
 				Map: cbc.CodeMap{
 					KeyATTaxCode: TaxCodeExempt,
diff --git a/tax/regime.go b/tax/regime.go
index 2ce7d157..372b5fd9 100644
--- a/tax/regime.go
+++ b/tax/regime.go
@@ -296,7 +296,14 @@ func (r *Regime) CorrectionDefinitionFor(schema string) *CorrectionDefinition {
 // Validate enures the region definition is valid, including all
 // subsequent categories.
 func (r *Regime) Validate() error {
-	err := validation.ValidateStruct(r,
+	return r.ValidateWithContext(context.Background())
+}
+
+// ValidateWithContext enures the region definition is valid, including all
+// subsequent categories, and passes through the context.
+func (r *Regime) ValidateWithContext(ctx context.Context) error {
+	ctx = context.WithValue(ctx, KeyRegime, r)
+	err := validation.ValidateStructWithContext(ctx, r,
 		validation.Field(&r.Country, validation.Required),
 		validation.Field(&r.Name, validation.Required),
 		validation.Field(&r.Description),
@@ -542,6 +549,10 @@ func checkRateValuesOrder(list interface{}) error {
 	// loop through and check order of Since value
 	for i := range values {
 		v := values[i]
+		if len(v.Zones) > 0 {
+			// TODO: check zone order also
+			continue
+		}
 		if date != nil && date.IsValid() {
 			if v.Since.IsValid() && !v.Since.Before(date.Date) {
 				return errors.New("invalid date order")
diff --git a/tax/regimes_test.go b/tax/regimes_test.go
new file mode 100644
index 00000000..f59dfba3
--- /dev/null
+++ b/tax/regimes_test.go
@@ -0,0 +1,16 @@
+package tax_test
+
+import (
+	"testing"
+
+	"github.com/invopop/gobl/tax"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAllRegimes(t *testing.T) {
+	for _, r := range tax.AllRegimes() {
+		t.Run(r.Name.String(), func(t *testing.T) {
+			assert.NoError(t, r.Validate())
+		})
+	}
+}
diff --git a/tax/scenario.go b/tax/scenario.go
index 37a385e0..03c37788 100644
--- a/tax/scenario.go
+++ b/tax/scenario.go
@@ -1,6 +1,8 @@
 package tax
 
 import (
+	"context"
+
 	"github.com/invopop/gobl/cbc"
 	"github.com/invopop/gobl/i18n"
 	"github.com/invopop/validation"
@@ -47,9 +49,9 @@ type ScenarioSummary struct {
 	Meta  cbc.Meta
 }
 
-// Validate checks the scenario set for errors.
-func (ss *ScenarioSet) Validate() error {
-	err := validation.ValidateStruct(ss,
+// ValidateWithContext checks the scenario set for errors.
+func (ss *ScenarioSet) ValidateWithContext(ctx context.Context) error {
+	err := validation.ValidateStructWithContext(ctx, ss,
 		validation.Field(&ss.Schema, validation.Required),
 		validation.Field(&ss.List, validation.Required),
 	)
@@ -116,10 +118,11 @@ func (s *Scenario) hasTags(docTags []cbc.Key) bool {
 }
 
 // Validate checks the scenario for errors.
-func (s *Scenario) Validate() error {
-	err := validation.ValidateStruct(s,
+func (s *Scenario) ValidateWithContext(ctx context.Context) error {
+	r := ctx.Value(KeyRegime).(*Regime)
+	err := validation.ValidateStructWithContext(ctx, s,
 		validation.Field(&s.Types),
-		validation.Field(&s.Tags),
+		validation.Field(&s.Tags, validation.Each(InKeyDefs(r.Tags))),
 		validation.Field(&s.Name),
 		validation.Field(&s.Note),
 		validation.Field(&s.Codes),