update validation logic

app/models/validations/sales/sale_information_validations.rb

@@ -147,15 +147,6 @@ module Validations::Sales::SaleInformationValidations
     end
   end
 
-  def validate_mortgage_used_and_stairbought(record)
-    return unless record.stairowned && record.mortgageused
-
-    if !record.stairowned_100? && record.mortgageused == 3
-      record.errors.add :stairowned, I18n.t("validations.sale_information.stairowned.mortgageused_dont_know")
-      record.errors.add :mortgageused, I18n.t("validations.sale_information.stairowned.mortgageused_dont_know")
-    end
-  end
-
   def check_non_staircasing_socialhomebuy_mortgage(record)
     return unless record.cashdis
 
@@ -237,16 +228,22 @@ module Validations::Sales::SaleInformationValidations
   end
 
   def validate_mortgage_used_dont_know(record)
-    return unless record.mortgageused == 3
+    return unless record.mortgage_use_unknown?
 
     if record.discounted_ownership_sale?
-      record.errors.add(:mortgageused, I18n.t("validations.invalid_option", question: "Was a mortgage used for the purchase of this property?"))
+      record.errors.add(:mortgageused, I18n.t("validations.invalid_option", question: "was a mortgage used for the purchase of this property?"))
     end
     if record.outright_sale? && record.saledate && !record.form.start_year_after_2024?
-      record.errors.add(:mortgageused, I18n.t("validations.invalid_option", question: "Was a mortgage used for the purchase of this property?"))
+      record.errors.add(:mortgageused, I18n.t("validations.invalid_option", question: "was a mortgage used for the purchase of this property?"))
+      record.errors.add(:saledate, I18n.t("validations.financial.mortgage_used.year"))
+    end
+    if record.shared_ownership_scheme? && record.is_not_staircasing?
+      record.errors.add(:mortgageused, I18n.t("validations.invalid_option", question: "was a mortgage used for the purchase of this property?"))
+      record.errors.add(:staircase, I18n.t("validations.financial.mortgage_used.staircasing"))
     end
-    if record.shared_ownership_scheme? && record.staircase && record.staircase != 1
-      record.errors.add(:mortgageused, I18n.t("validations.invalid_option", question: "Was a mortgage used for the purchase of this property?"))
+    if record.stairowned && !record.stairowned_100?
+      record.errors.add :stairowned, I18n.t("validations.sale_information.stairowned.mortgageused_dont_know")
+      record.errors.add :mortgageused, I18n.t("validations.sale_information.stairowned.mortgageused_dont_know")
     end
   end