diff --git a/bill/delivery.go b/bill/delivery.go
index 36e71a06..a7cd129e 100644
--- a/bill/delivery.go
+++ b/bill/delivery.go
@@ -14,7 +14,7 @@ type Delivery struct {
 	Receiver *org.Party `json:"receiver,omitempty" jsonschema:"title=Receiver"`
 	// Identities is used to define specific codes or IDs that may be used to
 	// identify the delivery.
-	Identities []*org.Identity `json:"identities,omitempty" jsonschema:"title=Identities"`
+	Identities []*org.Identity `json:"identities,omitempty" jsonschema:"title=Identities" en16931:"BT-71"`
 	// When the goods should be expected.
 	Date *cal.Date `json:"date,omitempty" jsonschema:"title=Date" en16931:"BT-72"`
 	// Period of time in which to expect delivery if a specific date is not available.
diff --git a/bill/line.go b/bill/line.go
index 6dcbe27a..129c7160 100644
--- a/bill/line.go
+++ b/bill/line.go
@@ -30,7 +30,7 @@ type Line struct {
 	// Charges applied to this line
 	Charges []*LineCharge `json:"charges,omitempty" jsonschema:"title=Charges" en16931:"BG-28"`
 	// Map of taxes to be applied and used in the invoice totals
-	Taxes tax.Set `json:"taxes,omitempty" jsonschema:"title=Taxes"`
+	Taxes tax.Set `json:"taxes,omitempty" jsonschema:"title=Taxes" en16931:"BG-30"`
 	// Total line amount after applying discounts to the sum (calculated).
 	Total num.Amount `json:"total" jsonschema:"title=Total" jsonschema_extras:"calculated=true" en16931:"BT-131"`
 	// Set of specific notes for this line that may be required for
diff --git a/org/item.go b/org/item.go
index 92c8f733..f58a2fd7 100644
--- a/org/item.go
+++ b/org/item.go
@@ -37,7 +37,7 @@ type Item struct {
 	// Currency used for the item's price.
 	Currency currency.Code `json:"currency,omitempty" jsonschema:"title=Currency"`
 	// Base price of a single unit to be sold.
-	Price num.Amount `json:"price" jsonschema:"title=Price"`
+	Price num.Amount `json:"price" jsonschema:"title=Price" en16931:"BT-146"`
 	// AltPrices defines a list of prices with their currencies that may be used
 	// as an alternative to the item's base price.
 	AltPrices []*currency.Amount `json:"alt_prices,omitempty" jsonschema:"title=Alternative Prices"`
diff --git a/tax/totals.go b/tax/totals.go
index 1743e8be..d5ba8d60 100644
--- a/tax/totals.go
+++ b/tax/totals.go
@@ -28,15 +28,15 @@ type RateTotal struct {
 	// this would be possible.
 	Country l10n.TaxCountryCode `json:"country,omitempty" jsonschema:"title=Country"`
 	// If the rate is defined with extensions, they'll be used to group by also.
-	Ext Extensions `json:"ext,omitempty" jsonschema:"title=Extensions"`
+	Ext Extensions `json:"ext,omitempty" jsonschema:"title=Extensions" en16931:"BT-118"`
 	// Base amount that the percentage is applied to.
-	Base num.Amount `json:"base" jsonschema:"title=Base"`
+	Base num.Amount `json:"base" jsonschema:"title=Base" en16931:"BT-116"`
 	// Percentage of the rate. Will be nil when taxes are **exempt**.
-	Percent *num.Percentage `json:"percent,omitempty" jsonschema:"title=Percent"`
+	Percent *num.Percentage `json:"percent,omitempty" jsonschema:"title=Percent" en16931:"BT-119"`
 	// Surcharge applied to the rate.
 	Surcharge *RateTotalSurcharge `json:"surcharge,omitempty" jsonschema:"title=Surcharge"`
 	// Total amount of rate, excluding surcharges
-	Amount num.Amount `json:"amount" jsonschema:"title=Amount"`
+	Amount num.Amount `json:"amount" jsonschema:"title=Amount" en16931:"BT-117"`
 }
 
 // RateTotalSurcharge reflects the sum surcharges inside the rate.