diff --git a/api/construct/views.py b/api/construct/views.py
index 3327947d96..23cce5ae0d 100644
--- a/api/construct/views.py
+++ b/api/construct/views.py
@@ -65,13 +65,14 @@ def get_lab_research(request):
 def update_lab_research(request):
     request_data = json.loads(request.body)
     result = Researches.update_lab_research_and_fractions(request_data["research"], True)
-    Log.log(
-        result["old_data"]["pk"],
-        220002,
-        request.user.doctorprofile,
-        {"old_data": result["old_data"], "new_data": result["new_data"]},
-    )
-    return JsonResponse(result)
+    if result["ok"]:
+        Log.log(
+            result["old_data"]["pk"],
+            220002,
+            request.user.doctorprofile,
+            {"old_data": result["old_data"], "new_data": result["new_data"]},
+        )
+    return JsonResponse({"ok": result["ok"], "message": result["message"]})
 
 
 @login_required
@@ -79,13 +80,14 @@ def update_lab_research(request):
 def create_lab_research(request):
     request_data = json.loads(request.body)
     result = Researches.create_lab_research_and_fractions(request_data["research"], True)
-    Log.log(
-        result["log_data"]["pk"],
-        220003,
-        request.user.doctorprofile,
-        result["log_data"],
-    )
-    return JsonResponse(result)
+    if result["ok"]:
+        Log.log(
+            result["log_data"]["pk"],
+            220003,
+            request.user.doctorprofile,
+            result["log_data"],
+        )
+    return JsonResponse({"ok": result["ok"], "pk": result["pk"], "message": result["message"]})
 
 
 @login_required
diff --git a/directory/models.py b/directory/models.py
index 413653ec2d..9547056179 100644
--- a/directory/models.py
+++ b/directory/models.py
@@ -616,6 +616,11 @@ def get_tube_data(research_pk: int, need_fractions: bool = False) -> dict:
                     research_tubes[fraction.relation_id]["fractions"] = [fraction_data]
         return research_tubes
 
+    @staticmethod
+    def check_duplicated_internal_code(internal_code):
+        result = Researches.objects.filter(internal_code=internal_code)
+        return result.exists()
+
     @staticmethod
     def get_laboratory_researches(podrazdelenie_id: int):
         if podrazdelenie_id == -1:
@@ -715,6 +720,10 @@ def update_lab_research_and_fractions(research_data, need_log_data: bool = False
         old_log_data = {}
         new_log_data = {}
         service_data = Researches.normalize_research_data(research_data)
+        internal_code_is_duplicated = Researches.check_duplicated_internal_code(service_data["internal_code"])
+        if internal_code_is_duplicated:
+            return {"ok": False, "message": "Такой внутренний код уже есть"}
+
         service = Researches.objects.filter(pk=service_data["pk"]).first()
         if need_log_data:
             old_log_data = service.as_json_lab_full()
@@ -745,8 +754,8 @@ def update_lab_research_and_fractions(research_data, need_log_data: bool = False
                     if need_log_data:
                         new_log_data["fractions"][new_fraction.pk] = Fractions.as_json(new_fraction)
         if need_log_data:
-            return {"ok": True, "old_data": old_log_data, "new_data": new_log_data}
-        return {"ok": True}
+            return {"ok": True, "old_data": old_log_data, "new_data": new_log_data, "message": ""}
+        return {"ok": True, "message": ""}
 
     @staticmethod
     def create_lab_service(service_data):
@@ -770,6 +779,9 @@ def create_lab_service(service_data):
     def create_lab_research_and_fractions(research_data, need_log_data: bool = False):
         log_data = {}
         service_data = Researches.normalize_research_data(research_data)
+        internal_code_is_duplicated = Researches.check_duplicated_internal_code(service_data["internal_code"])
+        if internal_code_is_duplicated:
+            return {"ok": False, "pk": None, "message": "Такой внутренний код уже есть"}
         new_service = Researches.create_lab_service(service_data)
         if need_log_data:
             log_data = new_service.as_json_lab_full()
diff --git a/l2-frontend/src/construct/ResearchDetail.vue b/l2-frontend/src/construct/ResearchDetail.vue
index a2080a9446..3b93dda291 100644
--- a/l2-frontend/src/construct/ResearchDetail.vue
+++ b/l2-frontend/src/construct/ResearchDetail.vue
@@ -568,14 +568,14 @@ const updateResearch = async () => {
   const researchValidate = validateResearch();
   if (researchValidate.ok) {
     await store.dispatch(actions.INC_LOADING);
-    const { ok } = await api('construct/laboratory/update-research', { research: research.value });
+    const { ok, message } = await api('construct/laboratory/update-research', { research: research.value });
     await store.dispatch(actions.DEC_LOADING);
     if (ok) {
       root.$emit('msg', 'ok', 'Обновлено');
       await getResearch();
       emit('updateResearch');
     } else {
-      root.$emit('msg', 'error', 'Ошибка');
+      root.$emit('msg', 'error', message);
     }
   } else {
     root.$emit('msg', 'error', researchValidate.message);
@@ -586,7 +586,7 @@ const createResearch = async () => {
   const researchValidate = validateResearch();
   if (researchValidate.ok) {
     await store.dispatch(actions.INC_LOADING);
-    const { ok, pk } = await api('construct/laboratory/create-research', { research: research.value });
+    const { ok, pk, message } = await api('construct/laboratory/create-research', { research: research.value });
     await store.dispatch(actions.DEC_LOADING);
     if (ok) {
       research.value.pk = pk;
@@ -594,7 +594,7 @@ const createResearch = async () => {
       await getResearch();
       emit('updateResearch');
     } else {
-      root.$emit('msg', 'error', 'Ошибка');
+      root.$emit('msg', 'error', message);
     }
   } else {
     root.$emit('msg', 'error', researchValidate.message);