diff --git a/src/redmine-net-api/RedmineKeys.cs b/src/redmine-net-api/RedmineKeys.cs
index 5bd7661e..8cc70a16 100644
--- a/src/redmine-net-api/RedmineKeys.cs
+++ b/src/redmine-net-api/RedmineKeys.cs
@@ -67,7 +67,7 @@ public static class RedmineKeys
         /// <summary>
         /// 
         /// </summary>
-        public const string ASSIGNABLE = "Assignable";
+        public const string ASSIGNABLE = "assignable";
         /// <summary>
         /// 
         /// </summary>
diff --git a/src/redmine-net-api/Serialization/Xml/Extensions/XmlReaderExtensions.cs b/src/redmine-net-api/Serialization/Xml/Extensions/XmlReaderExtensions.cs
index f0312351..1c762b1a 100644
--- a/src/redmine-net-api/Serialization/Xml/Extensions/XmlReaderExtensions.cs
+++ b/src/redmine-net-api/Serialization/Xml/Extensions/XmlReaderExtensions.cs
@@ -87,6 +87,23 @@ public static bool ReadAttributeAsBoolean(this XmlReader reader, string attribut
             return result;
         }
 
+        /// <summary>
+        /// Reads the element content as nullable boolean.
+        /// </summary>
+        /// <param name="reader">The reader.</param>
+        /// <returns></returns>
+        public static bool? ReadElementContentAsNullableBoolean(this XmlReader reader)
+        {
+            var content = reader.ReadElementContentAsString();
+
+            if (content.IsNullOrWhiteSpace() || !bool.TryParse(content, out var result))
+            {
+                return null;
+            }
+
+            return result;
+        }
+        
         /// <summary>
         /// Reads the element content as nullable date time.
         /// </summary>
diff --git a/src/redmine-net-api/Types/Permission.cs b/src/redmine-net-api/Types/Permission.cs
index 3a658453..fcfcbbf1 100644
--- a/src/redmine-net-api/Types/Permission.cs
+++ b/src/redmine-net-api/Types/Permission.cs
@@ -77,23 +77,9 @@ public void WriteXml(XmlWriter writer) { }
         /// <param name="reader"></param>
         public void ReadJson(JsonReader reader)
         {
-            while (reader.Read())
+            if (reader.TokenType == JsonToken.String)
             {
-                if (reader.TokenType == JsonToken.EndObject)
-                {
-                    return;
-                }
-
-                if (reader.TokenType != JsonToken.PropertyName)
-                {
-                    continue;
-                }
-
-                switch (reader.Value)
-                {
-                    case RedmineKeys.PERMISSION: Info = reader.ReadAsString(); break;
-                    default: reader.Read(); break;
-                }
+                Info = reader.Value as string;
             }
         }
 
diff --git a/src/redmine-net-api/Types/Role.cs b/src/redmine-net-api/Types/Role.cs
index 366ce69e..40ac4122 100644
--- a/src/redmine-net-api/Types/Role.cs
+++ b/src/redmine-net-api/Types/Role.cs
@@ -1,4 +1,4 @@
-/*
+/*
    Copyright 2011 - 2023 Adrian Popescu
 
    Licensed under the Apache License, Version 2.0 (the "License");
@@ -59,7 +59,7 @@ public sealed class Role : IdentifiableName, IEquatable<Role>
         /// <summary>
         /// 
         /// </summary>
-        public bool IsAssignable { get; set; }
+        public bool? IsAssignable { get; set; }
         #endregion
 
         #region Implementation of IXmlSerialization
@@ -82,6 +82,7 @@ public override void ReadXml(XmlReader reader)
                 {
                     case RedmineKeys.ID: Id = reader.ReadElementContentAsInt(); break;
                     case RedmineKeys.NAME: Name = reader.ReadElementContentAsString(); break;
+                    case RedmineKeys.ASSIGNABLE: IsAssignable = reader.ReadElementContentAsNullableBoolean(); break;
                     case RedmineKeys.PERMISSIONS: Permissions = reader.ReadElementContentAsCollection<Permission>(); break;
                     default: reader.Read(); break;
                 }
@@ -113,6 +114,7 @@ public override void ReadJson(JsonReader reader)
                 {
                     case RedmineKeys.ID: Id = reader.ReadAsInt(); break;
                     case RedmineKeys.NAME: Name = reader.ReadAsString(); break;
+                    case RedmineKeys.ASSIGNABLE: IsAssignable = reader.ReadAsBoolean(); break;
                     case RedmineKeys.PERMISSIONS: Permissions = reader.ReadAsCollection<Permission>(); break;
                     default: reader.Read(); break;
                 }
@@ -129,7 +131,11 @@ public override void ReadJson(JsonReader reader)
         public bool Equals(Role other)
         {
             if (other == null) return false;
-            return Id == other.Id && Name == other.Name;
+            return EqualityComparer<int>.Default.Equals(Id, other.Id) &&
+                   EqualityComparer<string>.Default.Equals(Name, other.Name) &&
+                   IsAssignable == other.IsAssignable &&
+                   EqualityComparer<IList<Permission>>.Default.Equals(Permissions, other.Permissions);
+
         }
 
         /// <summary>
@@ -156,6 +162,7 @@ public override int GetHashCode()
                 var hashCode = 13;
                 hashCode = HashCodeHelper.GetHashCode(Id, hashCode);
                 hashCode = HashCodeHelper.GetHashCode(Name, hashCode);
+                hashCode = HashCodeHelper.GetHashCode(IsAssignable, hashCode);
                 hashCode = HashCodeHelper.GetHashCode(Permissions, hashCode);
                 return hashCode;
             }