diff --git a/EnvelopeGenerator.Domain/Entities/Envelope.cs b/EnvelopeGenerator.Domain/Entities/Envelope.cs
index 9d92e6f8..0650a97b 100644
--- a/EnvelopeGenerator.Domain/Entities/Envelope.cs
+++ b/EnvelopeGenerator.Domain/Entities/Envelope.cs
@@ -134,13 +134,13 @@ namespace EnvelopeGenerator.Domain.Entities
         public byte[] DOC_RESULT { get; set; }
 
         // TODO: * Check the Form App and remove the default value
-        public IEnumerable<EnvelopeDocument> Documents { get; set; } = new List<EnvelopeDocument>();
+        public List<EnvelopeDocument> Documents { get; set; } = new List<EnvelopeDocument>();
 
         // TODO: * Check the Form App and remove the default value
-        public IEnumerable<EnvelopeHistory> History { get; set; } = new List<EnvelopeHistory>();
+        public List<EnvelopeHistory> History { get; set; } = new List<EnvelopeHistory>();
 
         // TODO: * Check the Form App and remove the default value
-        public ICollection<Receiver> Receivers { get; set; } = new List<Receiver>();
+        public List<Receiver> Receivers { get; set; } = new List<Receiver>();
 
         /// <summary>
         /// Validates whether the receiver and document data are complete.
diff --git a/EnvelopeGenerator.Domain/Entities/Receiver.cs b/EnvelopeGenerator.Domain/Entities/Receiver.cs
index 9c69c94a..91a6f437 100644
--- a/EnvelopeGenerator.Domain/Entities/Receiver.cs
+++ b/EnvelopeGenerator.Domain/Entities/Receiver.cs
@@ -34,7 +34,7 @@ namespace EnvelopeGenerator.Domain.Entities
         [Column("TFA_REG_DEADLINE", TypeName = "datetime")]
         public DateTime TfaRegDeadline { get; set; }
 
-        public IEnumerable<EnvelopeReceiver> EnvelopeReceivers { get; set; }
+        public List<EnvelopeReceiver> EnvelopeReceivers { get; set; }
 
         [NotMapped]
         public string Name { get; set; }