feat: only add mortgageuesd error to relevant mortgageused field

app/services/bulk_upload/sales/year2023/row_parser.rb

@@ -754,7 +754,7 @@ private
       stairbought: %i[field_88],
       stairowned: %i[field_89],
       socprevten: %i[field_102],
-      mortgageused: %i[field_105 field_119 field_128],
+      mortgageused: [mortgageused_field],
       soctenant: %i[field_99],
 
       uprn: %i[field_19],
@@ -1103,6 +1103,12 @@ private
     return field_128 if outright_sale?
   end
 
+  def mortgageused_field
+    return :field_105 if shared_ownership?
+    return :field_119 if discounted_ownership?
+    return :field_128 if outright_sale?
+  end
+
   def owning_organisation
     @owning_organisation ||= Organisation.find_by_id_on_multiple_fields(field_1)
   end

app/services/bulk_upload/sales/year2024/row_parser.rb

@@ -760,7 +760,7 @@ private
       stairbought: %i[field_87],
       stairowned: %i[field_88],
       socprevten: %i[field_100],
-      mortgageused: %i[field_103 field_117 field_126],
+      mortgageused: [mortgageused_field],
 
       uprn: %i[field_22],
       address_line1: %i[field_23],
@@ -1116,6 +1116,12 @@ private
     return field_126 if outright_sale?
   end
 
+  def mortgageused_field
+    return :field_103 if shared_ownership?
+    return :field_117 if discounted_ownership?
+    return :field_126 if outright_sale?
+  end
+
   def owning_organisation
     @owning_organisation ||= Organisation.find_by_id_on_multiple_fields(field_1)
   end