ERROR: "Period start date must begin on the 1st day of the month."
Solution: "Period Start" for deceased estate should start from 1 July and "Period End" should always be 30 June. Though users can set any periods, ATO usually fix this to the regular period, so we recommend to set the period start and end dates regular period in order to avoid sync errors with ATO.
Regarding the "Date of Death", you can enter the actual date in the trust tax form. Per example image below, the Date of Death is 15 Nov. 2023.