diff --git a/EnvelopeGenerator.Domain/Entities/History.cs b/EnvelopeGenerator.Domain/Entities/History.cs
index f52700a5..b7a6bc4c 100644
--- a/EnvelopeGenerator.Domain/Entities/History.cs
+++ b/EnvelopeGenerator.Domain/Entities/History.cs
@@ -37,6 +37,7 @@ namespace EnvelopeGenerator.Domain.Entities
         [Column("ACTION_DATE", TypeName = "datetime")]
         public DateTime? ActionDate { get; set; }
 
+        [NotMapped]
         public DateTime? ChangedWhen { get => ActionDate; set => ActionDate = value; }
 
         [Column("COMMENT", TypeName = "nvarchar(max)")]