diff --git a/DigitalData.Core.Abstractions/Application/ICRUDService.cs b/DigitalData.Core.Abstractions/Application/ICRUDService.cs
index beaf873..9dfec8d 100644
--- a/DigitalData.Core.Abstractions/Application/ICRUDService.cs
+++ b/DigitalData.Core.Abstractions/Application/ICRUDService.cs
@@ -4,7 +4,7 @@ using DigitalData.Core.DTO;
 namespace DigitalData.Core.Abstractions.Application
 {
     public interface ICRUDService<TCreateDto, TReadDto, TUpdateDto, TEntity, TId>
-        where TCreateDto : class where TReadDto : class where TUpdateDto : class where TEntity : class
+        where TCreateDto : class where TReadDto : class where TUpdateDto : IUnique<TId> where TEntity : class
     {
         Task<DataResult<TId>> CreateAsync(TCreateDto createDto);
 
diff --git a/DigitalData.Core.Application/CRUDService.cs b/DigitalData.Core.Application/CRUDService.cs
index e098e6e..c4ddd0a 100644
--- a/DigitalData.Core.Application/CRUDService.cs
+++ b/DigitalData.Core.Application/CRUDService.cs
@@ -4,6 +4,7 @@ using AutoMapper;
 using System.Reflection;
 using System.ComponentModel.DataAnnotations;
 using DigitalData.Core.DTO;
+using DigitalData.Core.Abstractions;
 
 namespace DigitalData.Core.Application
 {
@@ -16,7 +17,7 @@ namespace DigitalData.Core.Application
     /// <typeparam name="TEntity">The entity type.</typeparam>
     /// <typeparam name="TId">The type of the identifier for the entity.</typeparam>
     public class CRUDService<TCRUDRepository, TCreateDto, TReadDto, TUpdateDto, TEntity, TId> : ICRUDService<TCreateDto, TReadDto, TUpdateDto, TEntity, TId>
-        where TCRUDRepository : ICRUDRepository<TEntity, TId> where TCreateDto : class where TReadDto : class where TUpdateDto : class where TEntity : class
+        where TCRUDRepository : ICRUDRepository<TEntity, TId> where TCreateDto : class where TReadDto : class where TUpdateDto : IUnique<TId> where TEntity : class
     {
         protected readonly TCRUDRepository _repository;
         protected readonly IMapper _mapper;