Reply To cazfi
the amount you can enter is limited by the amount of gold actually available.
Which is likely buggy in that I don't see it adjusted later if the player loses and gains gold outside the specific negotiation. -> maybe open a new ticket
Patch for the issue of this ticket attached.
I was starting to look at https://www.hostedredmine.com/issues/768422 (for branches with ruleset defined clauses), but noticed that Qt-client's existing handling of trading_gold server setting isn't very sane. All the widgets are there either way. The only difference is that when gold trading is enabled, the amount you can enter is limited by the amount of gold actually available. When gold trading is disabled, you can enter any value.