Execution date field in Completion panel is used to schedule the transaction.
If the execution date is set, the transaction will not be processed before this date. you can enter an Execution Date should you wish to execute the transaction at some future time instead of straight away (i.e. the pre-capture of processes).
If a date is entered in the Date of execution field, all services in the service sequence for this transaction that are dependent on the PDD service. Check date of execution are only executed when this date is reached.