diff --git a/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs b/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs
index 80eebd829..5599c0b91 100644
--- a/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs
+++ b/backend/FwLite/FwDataMiniLcmBridge/Api/FwDataMiniLcmApi.cs
@@ -429,6 +429,7 @@ public Task<ComplexFormType> UpdateComplexFormType(Guid id, UpdateObjectInput<Co
 
     public async Task<ComplexFormType> UpdateComplexFormType(ComplexFormType before, ComplexFormType after)
     {
+        await validators.ValidateAndThrow(after);
         await ComplexFormTypeSync.Sync(before, after, this);
         return ToComplexFormType(ComplexFormTypesFlattened.Single(c => c.Guid == after.Id));
     }
diff --git a/backend/FwLite/LcmCrdt/CrdtMiniLcmApi.cs b/backend/FwLite/LcmCrdt/CrdtMiniLcmApi.cs
index 44fa6fcd0..3663434ff 100644
--- a/backend/FwLite/LcmCrdt/CrdtMiniLcmApi.cs
+++ b/backend/FwLite/LcmCrdt/CrdtMiniLcmApi.cs
@@ -192,6 +192,7 @@ public async Task<ComplexFormType> UpdateComplexFormType(Guid id, UpdateObjectIn
 
     public async Task<ComplexFormType> UpdateComplexFormType(ComplexFormType before, ComplexFormType after)
     {
+        await validators.ValidateAndThrow(after);
         await ComplexFormTypeSync.Sync(before, after, this);
         return await GetComplexFormType(after.Id) ?? throw new NullReferenceException($"unable to find complex form type with id {after.Id}");
     }