Quantity and Date Calculations
Schedule Update from MRP performs the following calculations:
1 Back-schedule for safety days from planned order due dates.
2 Back-schedule for ship/delivery pattern from safety day schedule. See
here.
3 Back-schedule for supplier calendar from ship/delivery schedule. See
here.
4 Allocate planned order quantities by percentage to each supplier based on Scheduled Order MRP % Maint (5.5.1.17) to create new quantities by planned order. See
here.
5 Revise quantities to Std Pack Qty multiple. See
here.
6 Display any unfulfilled prior cumulative requirements.
7 Create a release, assign a Release ID and determine whether quantities are firm (within the Firm Days time fence) or planned. See
here.
8 Calculate fabrication and raw authorization quantities and start and end dates.
The start date is the active start date. The end date is calculated by adding the number of days specified in Raw Auth Days and Fab Auth Days to this date. The quantity requirements between the active start date and the calculated end date are the schedule quantities displayed on the shipping schedule.
9 Generate a shipping schedule containing daily requirements. When an SDT code is specified, bucket quantities into the ship delivery times for each day.
Shipping schedules are generated only when:
• Scheduled days are specified in the scheduled order.
• Generate Ship Schedules from MRP is Yes on the scheduled order line.
• Generate Shipping Schedules is Yes in Schedule Update from MRP.
10 Allocate quantities using ship/delivery pattern.
11 Zero requirement schedules are sent to the supplier only when Send Zero Requirements is Yes in Supplier Controls Maintenance. See
here.
12 Generate a planning schedule.
When you create a planning schedule but not the corresponding shipping schedule, the daily requirements display on the planning schedule as planned requirements. This only occurs when Schedule Days is greater than 1 on the applicable scheduled order line.