diff --git a/EnvelopeGenerator.Domain/Entities/Envelope.cs b/EnvelopeGenerator.Domain/Entities/Envelope.cs
index 741a3b93..fadf40e9 100644
--- a/EnvelopeGenerator.Domain/Entities/Envelope.cs
+++ b/EnvelopeGenerator.Domain/Entities/Envelope.cs
@@ -108,6 +108,10 @@ public class Envelope
     [Column("ENVELOPE_TYPE")]
     public int? EnvelopeTypeId { get; set; }
 
+    [JsonIgnore]
+    [NotMapped]
+    public bool ReadOnly => EnvelopeTypeId == 2;
+    
     [Column("CERTIFICATION_TYPE")]
     public int? CertificationType { get; set; }