diff --git a/app/services/merge/merge_organisations_service.rb b/app/services/merge/merge_organisations_service.rb
index 9f0759d33..147a1a094 100644
--- a/app/services/merge/merge_organisations_service.rb
+++ b/app/services/merge/merge_organisations_service.rb
@@ -85,6 +85,9 @@ private
 
   def merge_lettings_logs(merging_organisation)
     merging_organisation.owned_lettings_logs.after_date(@merge_date.to_time).each do |lettings_log|
+      if lettings_log.managing_organisation == merging_organisation
+        lettings_log.managing_organisation = @absorbing_organisation
+      end
       if lettings_log.scheme.present?
         scheme_to_set = @absorbing_organisation.owned_schemes.find_by(service_name: lettings_log.scheme.service_name)
         location_to_set = scheme_to_set.locations.find_by(name: lettings_log.location&.name, postcode: lettings_log.location&.postcode)
@@ -113,7 +116,10 @@ private
   end
 
   def merge_sales_logs(merging_organisation)
-    merging_organisation.sales_logs.after_date(@merge_date.to_time).each do |sales_log|
+    merging_organisation.owned_sales_logs.after_date(@merge_date.to_time).each do |sales_log|
+      if sales_log.managing_organisation == merging_organisation
+        sales_log.managing_organisation = @absorbing_organisation
+      end
       sales_log.owning_organisation = @absorbing_organisation
       if sales_log.collection_period_open?
         sales_log.skip_dpo_validation = true
@@ -122,6 +128,10 @@ private
         sales_log.save!(validate: false)
       end
     end
+    merging_organisation.managed_sales_logs.after_date(@merge_date.to_time).each do |sales_log|
+      sales_log.managing_organisation = @absorbing_organisation
+      sales_log.save!(validate: false)
+    end
   end
 
   def mark_organisation_as_merged(merging_organisation)
diff --git a/spec/services/merge/merge_organisations_service_spec.rb b/spec/services/merge/merge_organisations_service_spec.rb
index d01b0525a..844ad9074 100644
--- a/spec/services/merge/merge_organisations_service_spec.rb
+++ b/spec/services/merge/merge_organisations_service_spec.rb
@@ -558,10 +558,16 @@ RSpec.describe Merge::MergeOrganisationsService do
         end
 
         context "and merging sales logs" do
-          let!(:sales_log) { create(:sales_log, saledate: Time.zone.today, owning_organisation: merging_organisation) }
+          let(:owning_organisation) { create(:organisation, holds_own_stock: true) }
+          let!(:sales_log) { create(:sales_log, saledate: Time.zone.today, owning_organisation: merging_organisation, purchid: "owned") }
+          let!(:managed_sales_log) { create(:sales_log, saledate: Time.zone.today, purchid: "managed") }
 
           before do
             create(:sales_log, saledate: Time.zone.today - 2.days, owning_organisation: merging_organisation)
+            create(:organisation_relationship) { create(:organisation_relationship, parent_organisation: owning_organisation, child_organisation: merging_organisation) }
+            managed_sales_log.update!(owning_organisation:, managing_organisation: merging_organisation, created_by: merging_organisation_user)
+            create(:sales_log, saledate: Time.zone.today - 2.days, owning_organisation: merging_organisation, created_by: merging_organisation_user, purchid: "ranom 1")
+            create(:sales_log, saledate: Time.zone.today - 2.days, owning_organisation:, managing_organisation: merging_organisation, created_by: merging_organisation_user, purchid: "ranom 2")
           end
 
           it "moves relevant logs" do
@@ -570,6 +576,9 @@ RSpec.describe Merge::MergeOrganisationsService do
             absorbing_organisation.reload
             expect(SalesLog.filter_by_owning_organisation(absorbing_organisation).count).to eq(1)
             expect(SalesLog.filter_by_owning_organisation(absorbing_organisation).first).to eq(sales_log)
+            expect(SalesLog.filter_by_managing_organisation(absorbing_organisation).count).to eq(2)
+            expect(SalesLog.filter_by_managing_organisation(absorbing_organisation)).to include(managed_sales_log)
+            expect(SalesLog.filter_by_managing_organisation(absorbing_organisation)).to include(sales_log)
           end
 
           it "rolls back if there's an error" do