Does your GAT get rejected when you place the orders? In that case you might want to check your code again,
Just tried a bracket plus GAT and it placed without an error or warning (though markets are closed).

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On Sat, Jul 24, 2021 at 04:06 PM, <refael.lasry@...> wrote:
thank you for your precise answer!
?
It took me quite some time to understands what did you mean. Also, GAT order doesn't work with brackets, I have no idea why.?