Yes, it will affect your purchasing power for all existing orders queuing in the exchange, your purchasing power will only be released and updated after the exchange is open, and when they have accepted your order placement.
Do note the following:
• A new amendment order cannot be entered if the previous amendment order for the same stock has not been processed. Once a cancellation order is successful, cancellation cannot be reversed.
• Acceptance of any amendments is subjected to stock exchange.
• For amendment or cancellation of existing BUY orders queuing with the exchange, your purchasing power will only be released and updated after the exchange is open, and when they have accepted your order request.