For more information on the prerequisites, see External Scheduling.

• You create an order in the SAP System and schedule it.

• If you have assigned the function module PM_ORDER_EXTERN_SCHED_DIALOG to the fixed value D in Customizing under Configure Communication, and entered the external scheduling system as the destination, the dialog box Scheduling agreement appears after the order has been scheduled.
• You enter your desired dates and select proposed dates.
• If you have assigned the function module PM_ORDER_EXTERN_SCHED_APPOINT to the fixed value A in Customizing, the system calls the function module PM_ORDER_EXTERN_SCHED_APPOINT after you have selected the pushbutton Proposed dates.
• The external system looks for a suitable date, and the function module PM_ORDER_EXTERN_SCHED_APPOINT is called up again.
• The SAP System proposes a list of dates, you select the most suitable ones, and return to the order processing screen.
• After you have saved the order, the system calls up the function module PM_ORDER_EXTERN_BOOK_DEFAULT.