If your supplier works different days than you do, set up a supplier-specific calendar for them in Supplier Calendar Maintenance (5.5.1.1). Schedule Update from MRP considers these calendars when generating schedule releases.

You must set Calendar/Working Firm Days to Calendar in Schedule Update from MRP (5.5.3.1) for the system to consider the supplier calendar when generating schedule releases. Also, the system uses the value of the Calendar/Working Firm Days field when printing schedule firm days in Schedule Print (5.5.3.8). If you specify working schedules, the system treats holidays as nonworking days when the supplier schedule is calculated with working firm days.

For suppliers that do not have supplier-specific calendars, the system uses the applicable shop calendar defined in Calendar Maintenance (36.2.5).