Clear mortgage if it's 0

app/models/validations/sales/financial_validations.rb

@@ -37,7 +37,7 @@ module Validations::Sales::FinancialValidations
   end
 
   def validate_mortgage(record)
-    record.errors.add :mortgage, I18n.t("validations.financial.mortgage") if record.mortgage_used? && record.mortgage&.zero?
+    record.errors.add :mortgage, :cannot_be_0, message: I18n.t("validations.financial.mortgage") if record.mortgage_used? && record.mortgage&.zero?
   end
 
   def validate_cash_discount(record)

app/services/imports/sales_logs_import_service.rb

@@ -225,6 +225,11 @@ module Imports
         attributes.delete("postcode_full")
         attributes["pcodenk"] = attributes["la"].present? ? 1 : nil
         save_sales_log(attributes, previous_status)
+      elsif sales_log.errors.of_kind?(:mortgage, :cannot_be_0)
+        @logger.warn("Log #{sales_log.old_id}: Removing mortgage because it cannot be 0")
+        @logs_overridden << sales_log.old_id
+        attributes.delete("mortgage")
+        save_sales_log(attributes, previous_status)
       else
         @logger.error("Log #{sales_log.old_id}: Failed to import")
         sales_log.errors.each do |error|

spec/services/imports/sales_logs_import_service_spec.rb

@@ -637,6 +637,30 @@ RSpec.describe Imports::SalesLogsImportService do
       end
     end
 
+    context "when mortgage value is 0" do
+      let(:sales_log_id) { "shared_ownership_sales_log" }
+
+      before do
+        sales_log_xml.at_xpath("//xmlns:CALCMORT").content = "0"
+      end
+
+      it "intercepts the relevant validation error" do
+        expect(logger).to receive(:warn).with(/Removing mortgage because it cannot be 0/)
+        expect { sales_log_service.send(:create_log, sales_log_xml) }
+          .not_to raise_error
+      end
+
+      it "clears out the referral answer" do
+        allow(logger).to receive(:warn)
+
+        sales_log_service.send(:create_log, sales_log_xml)
+        sales_log = SalesLog.find_by(old_id: sales_log_id)
+
+        expect(sales_log).not_to be_nil
+        expect(sales_log.mortgage).to be_nil
+      end
+    end
+
     context "and it has an invalid income" do
       let(:sales_log_id) { "shared_ownership_sales_log" }