diff --git a/OpenActive.NET/models/Organization.cs b/OpenActive.NET/models/Organization.cs
index 03e89c0..2172c63 100644
--- a/OpenActive.NET/models/Organization.cs
+++ b/OpenActive.NET/models/Organization.cs
@@ -105,7 +105,7 @@ public override string ToString()
         /// </summary>
         [DataMember(Name = "hasAccount", EmitDefaultValue = false, Order = 12)]
         [JsonConverter(typeof(ValuesConverter))]
-        public virtual CustomerAccount HasAccount { get; set; }
+        public virtual ReferenceValue<CustomerAccount> HasAccount { get; set; }
 
         /// <summary>
         /// Indicates whether the Seller allows open booking or not
diff --git a/OpenActive.NET/models/Person.cs b/OpenActive.NET/models/Person.cs
index ded5901..32f1297 100644
--- a/OpenActive.NET/models/Person.cs
+++ b/OpenActive.NET/models/Person.cs
@@ -152,7 +152,7 @@ public override string ToString()
         /// </summary>
         [DataMember(Name = "hasAccount", EmitDefaultValue = false, Order = 16)]
         [JsonConverter(typeof(ValuesConverter))]
-        public virtual CustomerAccount HasAccount { get; set; }
+        public virtual ReferenceValue<CustomerAccount> HasAccount { get; set; }
 
         /// <summary>
         /// Indicates whether the Seller allows open booking