diff --git a/DigitalData.UserManager.Domain/Entities/UserRep.cs b/DigitalData.UserManager.Domain/Entities/UserRep.cs
index 4ced916..ef4aa48 100644
--- a/DigitalData.UserManager.Domain/Entities/UserRep.cs
+++ b/DigitalData.UserManager.Domain/Entities/UserRep.cs
@@ -1,4 +1,5 @@
-using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
 
 namespace DigitalData.UserManager.Domain.Entities
 {
@@ -17,9 +18,11 @@ namespace DigitalData.UserManager.Domain.Entities
         [Column("REPR_USER")]
         public int? RepUserId { get; set; }
 
+        [Required]
         [Column("VALID_FROM")]
         public required DateTime ValidFrom { get; set; }
 
+        [Required]
         [Column("VALID_TO")]
         public required DateTime ValidTo { get; set; }