diff --git a/app/models/derived_variables/lettings_log_variables.rb b/app/models/derived_variables/lettings_log_variables.rb
index 1b1817ec3..96b937ab4 100644
--- a/app/models/derived_variables/lettings_log_variables.rb
+++ b/app/models/derived_variables/lettings_log_variables.rb
@@ -9,8 +9,6 @@ module DerivedVariables::LettingsLogVariables
   end
 
   def set_derived_fields!
-    # TODO: Remove once we support parent/child relationships
-    self.managing_organisation_id ||= owning_organisation_id
     if rsnvac.present?
       self.newprop = has_first_let_vacancy_reason? ? 1 : 2
     end