feat: create reset_mcrdate! method

app/models/lettings_log.rb

@@ -27,6 +27,7 @@ class LettingsLog < Log
   before_validation :process_postcode_changes!, if: :postcode_full_changed?
   before_validation :process_previous_postcode_changes!, if: :ppostcode_full_changed?
   before_validation :reset_voiddate!, if: :startdate_changed?
+  before_validation :reset_mrcdate!, if: :startdate_changed?
   before_validation :reset_invalidated_dependent_fields!
   before_validation :reset_location_fields!, unless: :postcode_known?
   before_validation :reset_previous_location_fields!, unless: :previous_postcode_known?
@@ -548,6 +549,14 @@ private
     end
   end
 
+  def reset_mrcdate!
+    validate_property_major_repairs(self)
+    if errors[:mrcdate].present? && unresolved?
+      self.mrcdate = nil
+      errors.clear
+    end
+  end
+
   def reset_scheme
     return unless scheme && owning_organisation