The relevant behavior occurs when both intraday and next day changes are made at the same time.
Intraday changes cannot be made when next day changes have not yet applied.
More specifically, settings need to be made as below:
Date Procedure
T Set the change to be effective on the following day (=tomorrow) and save it.
T+1 Change to be effective on the following day (=tomorrow) is applied.
Perform the change to be effectyive on same day (=today).
For details regarding intraday changes and next day changes, please refer to “Understanding Intraday vs Next Day Changes” of “TradeGuard_User's_Guide”.