diff --git a/app/models/validations/sales/sale_information_validations.rb b/app/models/validations/sales/sale_information_validations.rb
index 129db57bd..c2036227a 100644
--- a/app/models/validations/sales/sale_information_validations.rb
+++ b/app/models/validations/sales/sale_information_validations.rb
@@ -89,11 +89,11 @@ module Validations::Sales::SaleInformationValidations
     return unless record.discount && record.value && record.la
 
     if record.london_property? && record.discount_value > 136_400
-      %i[discount value la postcode uprn].each do |field|
+      %i[discount value la postcode_full uprn].each do |field|
         record.errors.add field, I18n.t("validations.sale_information.value.over_discounted_london_max", discount_value: record.field_formatted_as_currency("discount_value"))
       end
     elsif record.property_not_in_london? && record.discount_value > 102_400
-      %i[discount value la postcode uprn].each do |field|
+      %i[discount value la postcode_full uprn].each do |field|
         record.errors.add field, I18n.t("validations.sale_information.value.over_discounted_max", discount_value: record.field_formatted_as_currency("discount_value"))
       end
     end
diff --git a/spec/models/validations/sales/sale_information_validations_spec.rb b/spec/models/validations/sales/sale_information_validations_spec.rb
index 6508ffbbb..24f2e22ee 100644
--- a/spec/models/validations/sales/sale_information_validations_spec.rb
+++ b/spec/models/validations/sales/sale_information_validations_spec.rb
@@ -632,7 +632,7 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
           expect(record.errors["value"]).to include("The percentage discount multiplied by the purchase price is £160,000.00. This figure should not be more than £136,400 for properties in London.")
           expect(record.errors["discount"]).to include("The percentage discount multiplied by the purchase price is £160,000.00. This figure should not be more than £136,400 for properties in London.")
           expect(record.errors["la"]).to include("The percentage discount multiplied by the purchase price is £160,000.00. This figure should not be more than £136,400 for properties in London.")
-          expect(record.errors["postcode"]).to include("The percentage discount multiplied by the purchase price is £160,000.00. This figure should not be more than £136,400 for properties in London.")
+          expect(record.errors["postcode_full"]).to include("The percentage discount multiplied by the purchase price is £160,000.00. This figure should not be more than £136,400 for properties in London.")
           expect(record.errors["uprn"]).to include("The percentage discount multiplied by the purchase price is £160,000.00. This figure should not be more than £136,400 for properties in London.")
         end
 
@@ -641,7 +641,7 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
           expect(record.errors["value"]).to be_empty
           expect(record.errors["discount"]).to be_empty
           expect(record.errors["la"]).to be_empty
-          expect(record.errors["postcode"]).to be_empty
+          expect(record.errors["postcode_full"]).to be_empty
           expect(record.errors["uprn"]).to be_empty
         end
       end
@@ -657,7 +657,7 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
           expect(record.errors["value"]).to include("The percentage discount multiplied by the purchase price is £104,000.00. This figure should not be more than £102,400 for properties outside of London.")
           expect(record.errors["discount"]).to include("The percentage discount multiplied by the purchase price is £104,000.00. This figure should not be more than £102,400 for properties outside of London.")
           expect(record.errors["la"]).to include("The percentage discount multiplied by the purchase price is £104,000.00. This figure should not be more than £102,400 for properties outside of London.")
-          expect(record.errors["postcode"]).to include("The percentage discount multiplied by the purchase price is £104,000.00. This figure should not be more than £102,400 for properties outside of London.")
+          expect(record.errors["postcode_full"]).to include("The percentage discount multiplied by the purchase price is £104,000.00. This figure should not be more than £102,400 for properties outside of London.")
           expect(record.errors["uprn"]).to include("The percentage discount multiplied by the purchase price is £104,000.00. This figure should not be more than £102,400 for properties outside of London.")
         end
 
@@ -666,7 +666,7 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
           expect(record.errors["value"]).to be_empty
           expect(record.errors["discount"]).to be_empty
           expect(record.errors["la"]).to be_empty
-          expect(record.errors["postcode"]).to be_empty
+          expect(record.errors["postcode_full"]).to be_empty
           expect(record.errors["uprn"]).to be_empty
         end
       end
@@ -680,7 +680,7 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
         expect(record.errors["value"]).to be_empty
         expect(record.errors["discount"]).to be_empty
         expect(record.errors["la"]).to be_empty
-        expect(record.errors["postcode"]).to be_empty
+        expect(record.errors["postcode_full"]).to be_empty
         expect(record.errors["uprn"]).to be_empty
       end
     end