diff --git a/src/organizations/test_companies.py b/src/organizations/test_companies.py
index 9175625..cb2f9d1 100644
--- a/src/organizations/test_companies.py
+++ b/src/organizations/test_companies.py
@@ -200,6 +200,25 @@ class TestCompanyDatasetService:
                     f"{legacy_module}.{legacy_record.__class__.__name__}"
                 )
                 record.legacy_pk = str(legacy_record.pk)
+                legacy_owner = (
+                    OrganizationSourceRecord.objects.filter(
+                        legacy_model=record.legacy_model,
+                        legacy_pk=record.legacy_pk,
+                    )
+                    .exclude(pk=record.pk)
+                    .select_related("extension")
+                    .first()
+                )
+                if legacy_owner is not None:
+                    if (
+                        legacy_owner.source != source
+                        or legacy_owner.extension.organization_id != organization.pk
+                    ):
+                        raise RuntimeError(
+                            "Legacy parser record is already linked to another "
+                            "organization source record"
+                        )
+                    legacy_owner.delete()
                 record.save(update_fields=["legacy_model", "legacy_pk", "updated_at"])
                 if source == ParserLoadLog.Source.FNS_REPORTS:
                     cls._refresh_financial_lines(
diff --git a/tests/apps/organizations/test_test_companies_commands.py b/tests/apps/organizations/test_test_companies_commands.py
index 18900e7..952e54d 100644
--- a/tests/apps/organizations/test_test_companies_commands.py
+++ b/tests/apps/organizations/test_test_companies_commands.py
@@ -216,6 +216,34 @@ class TestCompaniesCommandsTest(TestCase):
         )
         self.assertEqual(OrganizationSourceRecord.objects.count(), 20 * 15)
 
+    def test_create_replaces_stale_source_record_for_same_legacy_row(self):
+        call_command("create_test_companies", stdout=StringIO())
+
+        company = Organization.objects.get(name="Тестовая компания 1")
+        stale_record = OrganizationSourceRecord.objects.get(
+            extension__organization=company,
+            source=ParserLoadLog.Source.PROCUREMENTS,
+        )
+        stale_record.external_id = "0373200000000000001"
+        stale_record.save(update_fields=["external_id"])
+
+        call_command("create_test_companies", stdout=StringIO())
+
+        canonical_record = OrganizationSourceRecord.objects.get(
+            extension__organization=company,
+            source=ParserLoadLog.Source.PROCUREMENTS,
+        )
+        self.assertEqual(
+            canonical_record.external_id,
+            f"{TEST_RECORD_PREFIX}:01:{ParserLoadLog.Source.PROCUREMENTS}",
+        )
+        self.assertEqual(
+            canonical_record.legacy_pk,
+            str(
+                ProcurementRecord.objects.get(purchase_number="0373200000000000001").pk
+            ),
+        )
+
     @override_settings(STATE_CORP_EXCHANGE_TOKEN=TEST_EXCHANGE_TOKEN)
     def test_created_source_records_are_included_in_state_corp_package(self):
         call_command("create_test_companies", stdout=StringIO())