On the Dunning screen, choose Schedule.

To start the dunning run immediately, select the Start immediately field.

To schedule the dunning run, enter the start date and time.

If you want to print the dunning notices straight away or schedule them, you can no longer edit the dunning proposal. For more information, see Editing Dunning Proposals

If you want to be able to edit the dunning proposal, you should carry out printing separately. For more information, see Printing Dunning Notices

To have the dunning notices printed after the dunning run, select Dunn. print with scheduling?

Choose Schedule.