diff --git a/app/services/imports/lettings_logs_import_service.rb b/app/services/imports/lettings_logs_import_service.rb
index 138126cbb..a53048d83 100644
--- a/app/services/imports/lettings_logs_import_service.rb
+++ b/app/services/imports/lettings_logs_import_service.rb
@@ -251,8 +251,12 @@ module Imports
       owner_id = meta_field_value(xml_doc, "owner-user-id").strip
       if owner_id.present?
         user = LegacyUser.find_by(old_user_id: owner_id)&.user
-        if user.blank?
-          @logger.error("Lettings log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which cannot be found. Assigning log to 'Unassigned' user.")
+        if user.blank? || (user.organisation_id != attributes["managing_organisation_id"] && user.organisation_id != attributes["owning_organisation_id"])
+          if user.blank?
+            @logger.error("Lettings log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which cannot be found. Assigning log to 'Unassigned' user.")
+          else
+            @logger.error("Lettings log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+          end
           if User.find_by(name: "Unassigned", organisation_id: attributes["managing_organisation_id"])
             user = User.find_by(name: "Unassigned", organisation_id: attributes["managing_organisation_id"])
           else
diff --git a/app/services/imports/sales_logs_import_service.rb b/app/services/imports/sales_logs_import_service.rb
index ecee55c22..157e797b4 100644
--- a/app/services/imports/sales_logs_import_service.rb
+++ b/app/services/imports/sales_logs_import_service.rb
@@ -179,8 +179,12 @@ module Imports
       if owner_id.present?
         user = LegacyUser.find_by(old_user_id: owner_id)&.user
 
-        if user.blank?
-          @logger.error("Sales log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which cannot be found. Assigning log to 'Unassigned' user.")
+        if user.blank? || user.organisation_id != attributes["owning_organisation_id"]
+          if user.blank?
+            @logger.error("Sales log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which cannot be found. Assigning log to 'Unassigned' user.")
+          else
+            @logger.error("Sales log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+          end
           if User.find_by(name: "Unassigned", organisation_id: attributes["owning_organisation_id"])
             user = User.find_by(name: "Unassigned", organisation_id: attributes["owning_organisation_id"])
           else
diff --git a/spec/services/imports/lettings_logs_import_service_spec.rb b/spec/services/imports/lettings_logs_import_service_spec.rb
index 1025fcd3b..7dc3d578d 100644
--- a/spec/services/imports/lettings_logs_import_service_spec.rb
+++ b/spec/services/imports/lettings_logs_import_service_spec.rb
@@ -172,6 +172,46 @@ RSpec.describe Imports::LettingsLogsImportService do
         end
       end
 
+      context "and the user exists on a different organisation" do
+        before do
+          create(:legacy_user, old_user_id: "fake_id")
+          lettings_log_xml.at_xpath("//meta:owner-user-id").content = "fake_id"
+        end
+
+        it "creates a new unassigned user" do
+          expect(logger).to receive(:error).with("Lettings log '0ead17cb-1668-442d-898c-0d52879ff592' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+          lettings_log_service.send(:create_log, lettings_log_xml)
+
+          lettings_log = LettingsLog.where(old_id: lettings_log_id).first
+          expect(lettings_log&.created_by&.name).to eq("Unassigned")
+        end
+
+        it "only creates one unassigned user" do
+          expect(logger).to receive(:error).with("Lettings log '0ead17cb-1668-442d-898c-0d52879ff592' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+          expect(logger).to receive(:error).with("Lettings log 'fake_id' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+          lettings_log_service.send(:create_log, lettings_log_xml)
+          lettings_log_xml.at_xpath("//meta:document-id").content = "fake_id"
+          lettings_log_service.send(:create_log, lettings_log_xml)
+
+          lettings_log = LettingsLog.where(old_id: lettings_log_id).first
+          second_lettings_log = LettingsLog.where(old_id: "fake_id").first
+          expect(lettings_log&.created_by).to eq(second_lettings_log&.created_by)
+        end
+
+        context "when unassigned user exist for a different organisation" do
+          let!(:other_unassigned_user) { create(:user, name: "Unassigned") }
+
+          it "creates a new unassigned user for current organisation" do
+            expect(logger).to receive(:error).with("Lettings log '0ead17cb-1668-442d-898c-0d52879ff592' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+            lettings_log_service.send(:create_log, lettings_log_xml)
+
+            lettings_log = LettingsLog.where(old_id: lettings_log_id).first
+            expect(lettings_log&.created_by&.name).to eq("Unassigned")
+            expect(lettings_log&.created_by).not_to eq(other_unassigned_user)
+          end
+        end
+      end
+
       it "correctly sets imported at date" do
         lettings_log_service.send(:create_log, lettings_log_xml)
 
diff --git a/spec/services/imports/sales_logs_import_service_spec.rb b/spec/services/imports/sales_logs_import_service_spec.rb
index bbabc5c1a..df279e5d5 100644
--- a/spec/services/imports/sales_logs_import_service_spec.rb
+++ b/spec/services/imports/sales_logs_import_service_spec.rb
@@ -163,6 +163,48 @@ RSpec.describe Imports::SalesLogsImportService do
       end
     end
 
+    context "and the user exists on a different organisation" do
+      let(:sales_log_id) { "shared_ownership_sales_log" }
+
+      before do
+        create(:legacy_user, old_user_id: "fake_id")
+        sales_log_xml.at_xpath("//meta:owner-user-id").content = "fake_id"
+      end
+
+      it "creates a new unassigned user" do
+        expect(logger).to receive(:error).with("Sales log 'shared_ownership_sales_log' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+        sales_log_service.send(:create_log, sales_log_xml)
+
+        sales_log = SalesLog.where(old_id: sales_log_id).first
+        expect(sales_log&.created_by&.name).to eq("Unassigned")
+      end
+
+      it "only creates one unassigned user" do
+        expect(logger).to receive(:error).with("Sales log 'shared_ownership_sales_log' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+        expect(logger).to receive(:error).with("Sales log 'fake_id' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+        sales_log_service.send(:create_log, sales_log_xml)
+        sales_log_xml.at_xpath("//meta:document-id").content = "fake_id"
+        sales_log_service.send(:create_log, sales_log_xml)
+
+        sales_log = SalesLog.where(old_id: sales_log_id).first
+        second_sales_log = SalesLog.where(old_id: "fake_id").first
+        expect(sales_log&.created_by).to eq(second_sales_log&.created_by)
+      end
+
+      context "when unassigned user exist for a different organisation" do
+        let!(:other_unassigned_user) { create(:user, name: "Unassigned") }
+
+        it "creates a new unassigned user for current organisation" do
+          expect(logger).to receive(:error).with("Sales log 'shared_ownership_sales_log' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
+          sales_log_service.send(:create_log, sales_log_xml)
+
+          sales_log = SalesLog.where(old_id: sales_log_id).first
+          expect(sales_log&.created_by&.name).to eq("Unassigned")
+          expect(sales_log&.created_by).not_to eq(other_unassigned_user)
+        end
+      end
+    end
+
     context "and the log startdate is before 22/23 collection period" do
       let(:sales_log_id) { "shared_ownership_sales_log" }