diff --git a/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoBase.cs b/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoBase.cs
index aec3a8659..4bad9e1b6 100644
--- a/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoBase.cs
+++ b/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoBase.cs
@@ -9,7 +9,7 @@ public record StructuredItemSlotInfoBase : StructuredBasePacket
     [FieldOrder(0)]
     public required int ItemID { get; init; }
 
-    [FieldOrder(1)]
+    [FieldOrder(1)] 
     public BPNullable<long> CashItemSN { get; init; } = new();
 
     [FieldOrder(2)] 
diff --git a/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoEquip.cs b/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoEquip.cs
index 888e1a17a..f44236e00 100644
--- a/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoEquip.cs
+++ b/src/protocol/Edelstein.Protocol.Gameplay/Entities/Inventories/StructuredItemSlotInfoEquip.cs
@@ -42,9 +42,11 @@ public record StructuredItemSlotInfoEquip : StructuredItemSlotInfoBase
     [FieldOrder(28)] public short Option3 { get; init; }
     [FieldOrder(29)] public short Socket1 { get; init; }
     [FieldOrder(30)] public short Socket2 { get; init; }
+
+    [Ignore] public bool HasSN => !CashItemSN.HasValue;
     
     [FieldOrder(31)]
-    [SerializeWhen(nameof(CashItemSN), null)]
+    [SerializeWhen(nameof(HasSN), true)]
     public long SN { get; init; }
 
     [FieldOrder(32)] public FDateTime DateEquipped { get; init; } = new();
diff --git a/src/protocol/Edelstein.Protocol.Network/Packets/Types/BPNullable.cs b/src/protocol/Edelstein.Protocol.Network/Packets/Types/BPNullable.cs
index 78e75b39b..409b2334e 100644
--- a/src/protocol/Edelstein.Protocol.Network/Packets/Types/BPNullable.cs
+++ b/src/protocol/Edelstein.Protocol.Network/Packets/Types/BPNullable.cs
@@ -4,7 +4,8 @@ namespace Edelstein.Protocol.Network.Packets.Types;
 
 public record BPNullable<T>
 {
-    [FieldOrder(0)] public bool HasValue { get; init; }
+    [FieldOrder(0)] 
+    public bool HasValue { get; init; }
     
     [FieldOrder(1)]
     [SerializeWhen(nameof(HasValue), true)]