diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/UnsTreeService.cs b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/UnsTreeService.cs
index 0fd500e2..056d722d 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/UnsTreeService.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/UnsTreeService.cs
@@ -1316,6 +1316,9 @@ public sealed class UnsTreeService(IDbContextFactory<OtOpcUaConfigDbContext> dbF
         if (await db.ScriptedAlarms.AnyAsync(a => a.ScriptedAlarmId == input.ScriptedAlarmId, ct))
             return new UnsMutationResult(false, $"ScriptedAlarm '{input.ScriptedAlarmId}' already exists.");
 
+        if (await db.ScriptedAlarms.AnyAsync(a => a.EquipmentId == equipmentId && a.Name == input.Name, ct))
+            return new UnsMutationResult(false, $"A scripted alarm named '{input.Name}' already exists on this equipment.");
+
         db.ScriptedAlarms.Add(new ScriptedAlarm
         {
             ScriptedAlarmId = input.ScriptedAlarmId,
@@ -1338,7 +1341,14 @@ public sealed class UnsTreeService(IDbContextFactory<OtOpcUaConfigDbContext> dbF
     {
         await using var db = await dbFactory.CreateDbContextAsync(ct);
         var entity = await db.ScriptedAlarms.FirstOrDefaultAsync(a => a.ScriptedAlarmId == scriptedAlarmId, ct);
-        if (entity is null) return new UnsMutationResult(false, "Row no longer exists.");
+        if (entity is null)
+        {
+            return new UnsMutationResult(false, "Row no longer exists.");
+        }
+
+        if (await db.ScriptedAlarms.AnyAsync(a => a.EquipmentId == entity.EquipmentId && a.Name == input.Name && a.ScriptedAlarmId != scriptedAlarmId, ct))
+            return new UnsMutationResult(false, $"A scripted alarm named '{input.Name}' already exists on this equipment.");
+
         db.Entry(entity).Property(e => e.RowVersion).OriginalValue = rowVersion;
         entity.Name = input.Name;
         entity.AlarmType = input.AlarmType;
@@ -1348,8 +1358,16 @@ public sealed class UnsTreeService(IDbContextFactory<OtOpcUaConfigDbContext> dbF
         entity.HistorizeToAveva = input.HistorizeToAveva;
         entity.Retain = input.Retain;
         entity.Enabled = input.Enabled;
-        try { await db.SaveChangesAsync(ct); return new UnsMutationResult(true, null); }
-        catch (DbUpdateConcurrencyException) { return new UnsMutationResult(false, "Another user changed this scripted alarm while you were editing."); }
+
+        try
+        {
+            await db.SaveChangesAsync(ct);
+            return new UnsMutationResult(true, null);
+        }
+        catch (DbUpdateConcurrencyException)
+        {
+            return new UnsMutationResult(false, "Another user changed this scripted alarm while you were editing.");
+        }
     }
 
     /// <inheritdoc />
@@ -1357,11 +1375,26 @@ public sealed class UnsTreeService(IDbContextFactory<OtOpcUaConfigDbContext> dbF
     {
         await using var db = await dbFactory.CreateDbContextAsync(ct);
         var entity = await db.ScriptedAlarms.FirstOrDefaultAsync(a => a.ScriptedAlarmId == scriptedAlarmId, ct);
-        if (entity is null) return new UnsMutationResult(true, null);
+        if (entity is null)
+        {
+            return new UnsMutationResult(true, null);
+        }
+
         db.Entry(entity).Property(e => e.RowVersion).OriginalValue = rowVersion;
         db.ScriptedAlarms.Remove(entity);
-        try { await db.SaveChangesAsync(ct); return new UnsMutationResult(true, null); }
-        catch (DbUpdateConcurrencyException) { return new UnsMutationResult(false, "Another user changed this alarm while you were viewing it."); }
-        catch (Exception ex) { return new UnsMutationResult(false, $"Delete failed: {ex.Message}."); }
+
+        try
+        {
+            await db.SaveChangesAsync(ct);
+            return new UnsMutationResult(true, null);
+        }
+        catch (DbUpdateConcurrencyException)
+        {
+            return new UnsMutationResult(false, "Another user changed this alarm while you were viewing it.");
+        }
+        catch (Exception ex)
+        {
+            return new UnsMutationResult(false, $"Delete failed: {ex.Message}.");
+        }
     }
 }
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceScriptedAlarmTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceScriptedAlarmTests.cs
index 5547626d..e3c497ab 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceScriptedAlarmTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/UnsTreeServiceScriptedAlarmTests.cs
@@ -74,4 +74,16 @@ public sealed class UnsTreeServiceScriptedAlarmTests
         (await svc.DeleteScriptedAlarmAsync("SA-1", dto!.RowVersion)).Ok.ShouldBeTrue();
         (await svc.LoadAlarmsForEquipmentAsync(UnsTreeTestDb.SeededEquipmentId)).ShouldBeEmpty();
     }
+
+    [Fact]
+    public async Task Create_rejects_duplicate_name_on_same_equipment()
+    {
+        var svc = SeededService();
+        (await svc.CreateScriptedAlarmAsync(UnsTreeTestDb.SeededEquipmentId, Sample("SA-1"))).Ok.ShouldBeTrue();
+        // Same Name ("Over-temp" from Sample), different id, same equipment → rejected.
+        var dup = await svc.CreateScriptedAlarmAsync(UnsTreeTestDb.SeededEquipmentId, Sample("SA-2"));
+        dup.Ok.ShouldBeFalse();
+        dup.Error.ShouldNotBeNull();
+        dup.Error!.ShouldContain("already exists");
+    }
 }