Follow up to 4e638838de1c99abbcc289d7679580cacb502b18 (#7468)

src/map/trade.cpp

@@ -484,7 +484,7 @@ void trade_tradeok(struct map_session_data *sd)
 	}
 
 	sd->state.deal_locked = 1;
-	clif_tradeitemok(*sd, 0, EXITEM_ADD_SUCCEED);
+	clif_tradeitemok(*sd, -2, EXITEM_ADD_SUCCEED); // We pass -2 which will becomes 0 in clif_tradeitemok (Official behavior)
 	clif_tradedeal_lock(sd, 0);
 	clif_tradedeal_lock(target_sd, 1);
 }