Noting that orders are processed at 12pm each Business Day, you can amend/cancel an order up to 12pm on the Business Day the order is due to be processed. However, once the order changes to “Pending” status (after it has been processed at 12pm) it can not be amended or cancelled.

For example, if you raised an order on a Saturday, the order will not be processed until 12pm on the following Monday, assuming Monday is a Business Day, so you have up until then to amend the order. If you raised the order on a Monday, and Monday is a Business Day, you still only have up until 12pm that day to amend the order.