diff --git a/SVSim.EmulatedEntrypoint/Services/ArenaTwoPickService.cs b/SVSim.EmulatedEntrypoint/Services/ArenaTwoPickService.cs
index 29df13b..bac2a30 100644
--- a/SVSim.EmulatedEntrypoint/Services/ArenaTwoPickService.cs
+++ b/SVSim.EmulatedEntrypoint/Services/ArenaTwoPickService.cs
@@ -313,7 +313,7 @@ public class ArenaTwoPickService : IArenaTwoPickService
         var deltas = new List<TwoPickRewardReceivedDto>();
 
         // Open inventory tx for grants.
-        await using var tx = await _inv.BeginAsync(viewerId);
+        await using var tx = await _inv.BeginAsync(viewerId, configure: cfg => cfg.Source = GrantSource.ArenaTwoPickFinish);
 
         // Group by RewardGroup, weighted-pick one row per group (Weight==0 excluded).
         foreach (var group in rewardRows.GroupBy(r => r.RewardGroup))