Trying to keep track of your trading with just sell and buy orders is very limiting. While this could be improved by improving that function, I also think that a game so focused on trading needs a bit more than that.
So I suggest a Gold Transaction Log.
Somewhere that shows everytime my amount of gold has changed, and why.
Basically a complete transaction log, with each transaction being categorized(ie sale, purchase, mob drop, quest reward, received from player, sent to player, gained in player trade, lost in player trade) and timestamped.
Each of these categories should be filterable, and have a bit of relevant info, ie like below:
-What did you sell/buy?(reference item, amount and price? Maybe even which tradingpost)
-Which type of mob, mabye even what level?
-Which quest?
-Who sent it/Who did you send it to?
-Who did you trade with? Which items where traded in addition to the gold being transfered.
– Dont log if no change to gold, since this is a gold transaction history.
Ideally the log is searchable, sortable and filterable on at least the common values like Category and Timestamp. But it would be a bonus if search included some of the other relevant data for each logpost.