diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index a4a3f9192..b168cffa5 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -518,6 +518,21 @@ class LettingsLog < Log
     is_carehome == 1
   end
 
+  def blank_compound_invalid_non_setup_fields!
+    super
+
+    validate_property_postcode(self)
+    self.postcode_known = nil if errors.of_kind?(:postcode_full, :wrong_format)
+
+    validate_net_income(self)
+    if errors.of_kind?(:earnings, :under_hard_min)
+      self.earnings = nil
+      self.incfreq = nil
+      self.incref = 1
+      self.net_income_known = 2
+    end
+  end
+
 private
 
   def reset_derived_questions
diff --git a/app/models/log.rb b/app/models/log.rb
index 4ee748eda..37c9a336f 100644
--- a/app/models/log.rb
+++ b/app/models/log.rb
@@ -98,6 +98,8 @@ class Log < ApplicationRecord
   def blank_invalid_non_setup_fields!
     setup_ids = form.setup_sections.flat_map(&:subsections).flat_map(&:questions).map(&:id)
 
+    blank_compound_invalid_non_setup_fields!
+
     errors.each do |error|
       next if setup_ids.include?(error.attribute.to_s)
 
@@ -136,6 +138,22 @@ class Log < ApplicationRecord
     format_as_currency(field_value)
   end
 
+  def blank_compound_invalid_non_setup_fields!
+    validate_previous_accommodation_postcode(self)
+    self.ppcodenk = nil if errors.of_kind?(:ppostcode_full, :wrong_format)
+
+    process_uprn_change!
+    if errors.of_kind?(:uprn, :uprn_error)
+      self.uprn_known = 0
+      self.uprn_confirmed = nil
+      self.address_line1 = nil
+      self.address_line2 = nil
+      self.town_or_city = nil
+      self.postcode_full = nil
+      self.county = nil
+    end
+  end
+
 private
 
   # Handle logs that are older than previous collection start date
diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index 4c849826d..d8ed31f0b 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -355,4 +355,16 @@ class SalesLog < Log
       "outright sale"
     end
   end
+
+  def blank_compound_invalid_non_setup_fields!
+    super
+
+    validate_property_postcode(self)
+    self.pcodenk = nil if errors.of_kind?(:postcode_full, :wrong_format)
+
+    validate_previous_postcode(self)
+    if errors.of_kind?(:postcode_full, :postcodes_not_matching)
+      self.ppcodenk = nil
+    end
+  end
 end