diff --git a/directory/models.py b/directory/models.py
index 58ae645728..b978f7ed39 100644
--- a/directory/models.py
+++ b/directory/models.py
@@ -1,6 +1,7 @@
 from django.contrib.auth.models import Group
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models, transaction
+from django.db.models import Q
 from jsonfield import JSONField
 
 from laboratory.settings import DEATH_RESEARCH_PK, EXCLUDE_TYPE_RESEARCH
@@ -745,6 +746,9 @@ def update_lab_research_and_fractions(research_data, need_log_data: bool = False
                 fraction_data = Fractions.normalize_fraction_data(fraction)
                 if service_fractions:
                     current_fraction = service_fractions.filter(pk=fraction["id"]).first()
+                    fsli_is_duplicated = Fractions.check_duplicated_fsli_code(current_fraction.pk, fraction_data["fsli"])
+                    if not fsli_is_duplicated["ok"]:
+                        return {"ok": False, "message": f"В анализе {fsli_is_duplicated['research_title']} есть такой же код ФСЛИ ({fraction_data['fsli']})"}
                 if current_fraction:
                     if need_log_data:
                         old_log_data["fractions"][current_fraction.pk] = Fractions.as_json(current_fraction)
@@ -752,6 +756,9 @@ def update_lab_research_and_fractions(research_data, need_log_data: bool = False
                     if need_log_data:
                         new_log_data["fractions"][current_fraction.pk] = Fractions.as_json(current_fraction)
                 else:
+                    fsli_is_duplicated = Fractions.check_duplicated_fsli_code(-1, fraction_data["fsli"])
+                    if not fsli_is_duplicated["ok"]:
+                        return {"ok": False, "message": f"В анализе {fsli_is_duplicated['research_title']} есть такой же код ФСЛИ ({fraction_data['fsli']})"}
                     new_fraction = Fractions.create_fraction(fraction_data, service.pk, relation.pk)
                     if need_log_data:
                         new_log_data["fractions"][new_fraction.pk] = Fractions.as_json(new_fraction)
@@ -792,6 +799,9 @@ def create_lab_research_and_fractions(research_data, need_log_data: bool = False
             relation = ReleationsFT.get_or_create_relation(tube)
             for fraction in tube["fractions"]:
                 fraction_data = Fractions.normalize_fraction_data(fraction)
+                fsli_is_duplicated = Fractions.check_duplicated_fsli_code(-1, fraction_data["fsli"])
+                if not fsli_is_duplicated["ok"]:
+                    return {"ok": False, "pk": new_service.pk, "message": f"В анализе {fsli_is_duplicated['research_title']} есть такой же код ФСЛИ ({fraction_data['fsli']})"}
                 new_fraction = Fractions.create_fraction(fraction_data, new_service.pk, relation.pk)
                 log_data["fractions"][new_fraction.pk] = Fractions.as_json(new_fraction)
         if need_log_data:
@@ -1485,6 +1495,14 @@ def create_fraction(fraction_data, service_pk, relation_pk):
         new_fraction.save()
         return new_fraction
 
+    @staticmethod
+    def check_duplicated_fsli_code(fraction_id: int, fsli_code):
+        fractions = Fractions.objects.filter(fsli=fsli_code).select_related('research').exclude(Q(pk=fraction_id) | Q(fsli=None))
+        if fractions.exists():
+            first_duplicated: Fractions = fractions.first()
+            return {"ok": False, "fraction_title": first_duplicated.title, "research_title": first_duplicated.research.title}
+        return {"ok": True}
+
 
 class Absorption(models.Model):
     """
diff --git a/l2-frontend/src/construct/ResearchDetail.vue b/l2-frontend/src/construct/ResearchDetail.vue
index 6168a2be7d..a06df629c6 100644
--- a/l2-frontend/src/construct/ResearchDetail.vue
+++ b/l2-frontend/src/construct/ResearchDetail.vue
@@ -567,6 +567,7 @@ const updateResearch = async () => {
       await getResearch();
       emit('updateResearch');
     } else {
+      await getResearch();
       root.$emit('msg', 'error', message);
     }
   } else {
@@ -586,6 +587,10 @@ const createResearch = async () => {
       await getResearch();
       emit('updateResearch');
     } else {
+      if (pk) {
+        research.value.pk = pk;
+        await getResearch();
+      }
       root.$emit('msg', 'error', message);
     }
   } else {