diff --git a/bill/outlay.go b/bill/outlay.go
index 0bc3cedf..b6cfdb95 100644
--- a/bill/outlay.go
+++ b/bill/outlay.go
@@ -47,8 +47,8 @@ func (o *Outlay) Validate() error {
 	)
 }
 
-// JSONUnmarshal helps migrate the desc field to description.
-func (o *Outlay) JSONUnmarshal(data []byte) error {
+// UnmarshalJSON helps migrate the desc field to description.
+func (o *Outlay) UnmarshalJSON(data []byte) error {
 	type Alias Outlay
 	aux := &struct {
 		Desc string `json:"desc"`
diff --git a/bill/outlay_test.go b/bill/outlay_test.go
index 23310039..2c2a01eb 100644
--- a/bill/outlay_test.go
+++ b/bill/outlay_test.go
@@ -1,6 +1,7 @@
 package bill
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/invopop/gobl/num"
@@ -10,7 +11,7 @@ import (
 
 func TestOutlayUnmarshal(t *testing.T) {
 	o := new(Outlay)
-	err := o.JSONUnmarshal([]byte(`{"desc":"foo"}`))
+	err := json.Unmarshal([]byte(`{"desc":"foo"}`), o)
 	require.NoError(t, err)
 	assert.Equal(t, "foo", o.Description)
 }
diff --git a/pay/advance.go b/pay/advance.go
index 483dbeed..d5ed96c2 100644
--- a/pay/advance.go
+++ b/pay/advance.go
@@ -60,8 +60,8 @@ func (a *Advance) CalculateFrom(totalWithTax num.Amount) {
 	}
 }
 
-// JSONUnmarshal helps migrate the desc field to description.
-func (a *Advance) JSONUnmarshal(data []byte) error {
+// UnmarshalJSON helps migrate the desc field to description.
+func (a *Advance) UnmarshalJSON(data []byte) error {
 	type Alias Advance
 	aux := &struct {
 		Desc string `json:"desc,omitempty"`
diff --git a/pay/advance_test.go b/pay/advance_test.go
index eca13ef0..64c3db3d 100644
--- a/pay/advance_test.go
+++ b/pay/advance_test.go
@@ -1,6 +1,7 @@
 package pay_test
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/invopop/gobl/pay"
@@ -10,7 +11,7 @@ import (
 
 func TestAdvanceUnmarshal(t *testing.T) {
 	a := new(pay.Advance)
-	err := a.JSONUnmarshal([]byte(`{"desc":"foo"}`))
+	err := json.Unmarshal([]byte(`{"desc":"foo"}`), a)
 	require.NoError(t, err)
 	assert.Equal(t, "foo", a.Description)
 }
diff --git a/regimes/co/examples/out/simplified.json b/regimes/co/examples/out/simplified.json
index 1c4273d6..514dc26e 100644
--- a/regimes/co/examples/out/simplified.json
+++ b/regimes/co/examples/out/simplified.json
@@ -4,7 +4,7 @@
 		"uuid": "8a51fd30-2a27-11ee-be56-0242ac120002",
 		"dig": {
 			"alg": "sha256",
-			"val": "2346991aab5ee704bd2b0ad14a06260aaf81fa7baca32c2bcd211cbc177aa6a2"
+			"val": "f23f62eb0cf68db88a55bd391e5410bfba7bf06c24e1a7a863191346b07b644c"
 		},
 		"draft": true
 	},
@@ -50,7 +50,7 @@
 		"payment": {
 			"advances": [
 				{
-					"desc": "Prepaid",
+					"description": "Prepaid",
 					"percent": "100%",
 					"amount": "238000.00"
 				}
diff --git a/regimes/es/examples/out/invoice-es-es-vateqs-provider.json b/regimes/es/examples/out/invoice-es-es-vateqs-provider.json
index f724d5f0..e1cc70ab 100644
--- a/regimes/es/examples/out/invoice-es-es-vateqs-provider.json
+++ b/regimes/es/examples/out/invoice-es-es-vateqs-provider.json
@@ -4,7 +4,7 @@
 		"uuid": "8a51fd30-2a27-11ee-be56-0242ac120002",
 		"dig": {
 			"alg": "sha256",
-			"val": "72e81bc4530fcd56154953690b56d170d3de5109a833642876e1dc33399f8d6e"
+			"val": "43f53d3728f1840ae9a652d616a7af90f827a937e375e9bf68d2e5d61c986ddc"
 		},
 		"draft": true
 	},
@@ -111,7 +111,7 @@
 			"advances": [
 				{
 					"date": "2021-09-01",
-					"desc": "Deposit paid upfront",
+					"description": "Deposit paid upfront",
 					"amount": "25.00"
 				}
 			],
diff --git a/regimes/mx/examples/out/prepaid-invoice.json b/regimes/mx/examples/out/prepaid-invoice.json
index 9e0e548b..28fe82cb 100644
--- a/regimes/mx/examples/out/prepaid-invoice.json
+++ b/regimes/mx/examples/out/prepaid-invoice.json
@@ -4,7 +4,7 @@
 		"uuid": "8a51fd30-2a27-11ee-be56-0242ac120002",
 		"dig": {
 			"alg": "sha256",
-			"val": "d8defb2c2e8f823f3ee18d3b75516cd38532f735a6f2635ceb7950af3fa7c150"
+			"val": "e87b2b2acf012c7fa3b9d9eda0046943b173b98ce47fa9bd27144f27b157b1b0"
 		},
 		"draft": true
 	},
@@ -94,13 +94,13 @@
 			"advances": [
 				{
 					"key": "cash",
-					"desc": "Anticipo",
+					"description": "Anticipo",
 					"percent": "10.0%",
 					"amount": "2.20"
 				},
 				{
 					"key": "card",
-					"desc": "Saldo",
+					"description": "Saldo",
 					"percent": "90.0%",
 					"amount": "19.84"
 				}