/Planned disbursements do not have single dates only periods.
We should change the definition to say, if it is a single date, then use the period start date. If it actually is a period then obviously you can put a start and an end date in e.g. 1st July - 31st July.
We think that making the start date mandatory (if the element is used) will improve data quality and enable publishers and data users to better check that their data is complete.