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E1: 31: Variable Lead Time Work Order Start Dates & Back Scheduling Calculations (Doc ID 881632.1)

Last updated on JULY 20, 2021

Applies to:

JD Edwards EnterpriseOne Shop Floor Control - Version XE and later
JD Edwards EnterpriseOne Product Data Management - Version XE and later
Information in this document applies to any platform.
System Code: 31-Shop Floor Management
P48013 - Manufacturing Work Order Processing
P41026 - Item Branch

Purpose

The purpose of this document is to explain how the start date gets calculated on a work order (P48013) when using Variable Leadtime.  For Fixed Leadtime, refer to Fixed Leadtime Work Order Start Dates & Back Scheduling Calculations Document 626117.1

This document explains various formulas used behind the calculation for Work Order Start Date field (STRT) in the Work Order Header Table (F4801).  It also covers the calculation of Leadtime Conversion factor (LTCV) stored in the Item Branch Table (F4102) which plays significant role in start date calculation.

This document only applies to Variable Leadtime items per the Item Branch, Add'l System Info (P41026), Fixed or Variable Leadtime (MRPP) field.

Overview

EnterpriseOne Shop Floor Management back scheduling routine ensures that the materials processed to a certain operation step are out of production and available to meet the required date for completing a (work) order.

Determining the Work Order Start Date and the Start Date of the First Operation Step on the routing there are 2 separate operations that take into consideration different details / factors and cannot be performed in the same time. The dates of the routing instructions can only be determined if the Work Order Start Date has been determined and the Work Order Header Start Date is calculated based on the Requested date of the Order.

The use of a Fixed Leadtime versus a Variable Leadtime can depend on whether there are consistent work order quantities for a manufactured item. A significant variation is any amount that requires more or less Leadtime. In case the work order quantities vary significantly, the use of variable Leadtime is advisable.

Fixed Leadtime remains the same, regardless of the quantity produced, while Variable Leadtime adjusts according to the quantity produced.

Work order routing start date will not consider work order start date when user manually changes the work order start date in work order header program and/or when user changes the fixed level Leadtime for an item in item branch plant. In both scenarios work order routing start date is back scheduled based on the fixed level Leadtime and work order requested date.


E1: 30: Product Data Mgmt (PDM) Implementation Guides Document 1109563.1
E1: 31: Shop Floor Control Implementation Guides Document 1109556.1
E1: 30: R30822A Understanding Leadtime Rollup Document 1381378.1
E1: 31: Manufacturing Work Orders & Routing Instructions Back Scheduling FAQ Document 646079.1

For detailed information on WO Header Dates refer the following documents:
E1: 31: P48013 Work Order Header Definition and Use Document 633410.1 and
E1: 34: Lot Effective Dates - Manufacturing and Purchasing Days Document 1053082.1.

Scope

Applicable to advanced Shop Floor Control users, who understand the basics of Leadtime, setup and queues.

Details

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In this Document
Purpose
 Overview
Scope
Details
 Definitions
 Prerequisites
 Work Order Header (P48013) Start Date
 Calculating the Start Date using Variable Leadtimes (8.10 onward)
 Leadtime Conversion Factor (LTCV) Calculation from R30822A
 Variable Leadtime Back Scheduling Calculation
 Backscheduling Example of Routing Instructions
 Particular Scenarios
 Back scheduling overlapping / concurrent operation steps:
 Planned Effective Date
 Calculating the Start Date during MRP/MPS processing (R3482/R3483)
 Troubleshooting Tips
 Tip 1. The start and end date are the same for all routing steps
 Tip 2. The operation(s) start and end dates are prior to the work order header start date
 Tip 3. Different results for Start and End Dates on the routing operations when attaching the routing interactively via 'Copy by Item' option versus Order Processing (R31410) program
 Tip 4. The WO Start Date change on the WO Header (P48013) does not trigger the expected change of the Routing Start Date (P3112)
 Tip 5. The Start and Request Dates of several WO routing steps changed after adding a new operation sequence onto a Work Order Routing (P3112) for a WO that has operation sequences already completed through e.g. Super Backflush (P31123)
References

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