diff --git a/DigitalData.Core.API/BasicCRUDControllerBase.cs b/DigitalData.Core.API/BasicCRUDControllerBase.cs
index c466d5d..0ce0d1e 100644
--- a/DigitalData.Core.API/BasicCRUDControllerBase.cs
+++ b/DigitalData.Core.API/BasicCRUDControllerBase.cs
@@ -1,5 +1,5 @@
+using DigitalData.Core.Abstractions;
 using DigitalData.Core.Abstractions.Application;
-using DigitalData.Core.Abstractions.Infrastructure;
 using Microsoft.AspNetCore.Mvc;
 
 namespace DigitalData.Core.API
@@ -8,8 +8,8 @@ namespace DigitalData.Core.API
     [Route("api/[controller]")]
     public class BasicCRUDControllerBase<TCRUDService, TDto, TEntity, TId> : CRUDControllerBase<TCRUDService, TDto, TDto, TDto, TEntity, TId>
         where TCRUDService : ICRUDService<TDto, TDto, TDto, TEntity, TId>
-        where TDto : class
-        where TEntity : class
+        where TDto : class, IUnique<TId>
+        where TEntity : class, IUnique<TId>
     {
         public BasicCRUDControllerBase(ILogger logger, TCRUDService service) : base(logger, service)
         {
diff --git a/DigitalData.Core.API/ReadControllerBase.cs b/DigitalData.Core.API/ReadControllerBase.cs
index 039be5a..9bcf578 100644
--- a/DigitalData.Core.API/ReadControllerBase.cs
+++ b/DigitalData.Core.API/ReadControllerBase.cs
@@ -1,3 +1,4 @@
+using DigitalData.Core.Abstractions;
 using DigitalData.Core.Abstractions.Application;
 using DigitalData.Core.DTO;
 using Microsoft.AspNetCore.Mvc;
@@ -15,7 +16,7 @@ namespace DigitalData.Core.API
     public class ReadControllerBase<TBasicCRUDService, TReadDto, TEntity, TId> : ControllerBase
         where TBasicCRUDService : IBasicCRUDService<TReadDto, TEntity, TId>
         where TReadDto : class
-        where TEntity : class
+        where TEntity : class, IUnique<TId>
     {
         protected readonly ILogger _logger;
         protected readonly TBasicCRUDService _service;