diff --git a/src/SharedEF/IGenericRepository.cs b/src/SharedEF/IGenericRepository.cs
index 8849c70..6e20d13 100644
--- a/src/SharedEF/IGenericRepository.cs
+++ b/src/SharedEF/IGenericRepository.cs
@@ -2,11 +2,11 @@ namespace SharedEF;
 
 public interface IGenericRepository<T>
 {
-    Task<IEnumerable<T>> GetItems(int index, int count, Enum? orderingProperty = null, bool descending = false);
-    Task<T> GetItemById(int id);
-    Task<T> UpdateItem(int oldItem, T newItem);
-    Task<T> AddItem(T item);
-    Task<bool> DeleteItem(T item);
+    Task<IEnumerable<T>> GetItems(int index, int count, string? orderingProperty = null, bool descending = false);
+    Task<T?> GetItemById(int id);
+    Task<T?> UpdateItem(int oldItem, T newItem);
+    Task<T?> AddItem(T item);
+    Task<bool> DeleteItem(int item);
     Task<int> GetNbItems();
-
+    
 }
\ No newline at end of file