Planning with assembly planning and predictive MRP (pMRP)

Objective

After completing this lesson, you will be able to explain assembly planning, planning without final assembly at header level, and use of predictive MRP.

Assembly Planning, Planning Without Final Assembly at Header Level, and Use of Predictive MRP

The following figure explains the assembly planning, a planning without final assembly at header level, and the use of predictive MRP.

This figure explains the assembly planning, a planning without final assembly at header level, and the use of predictive MRP. Predictive MRP is a new Planning Strategy in SAP S/4 HANA

Process Overview

This figure explains the first steps of the predictive MRP process. The header material is connected the strategy P6, the assemblies and the items to strategy 70. At header level exist inactive planned independent requirements. At item and assembly level pMRP takes place.

Strategy P6 creates inactive planned independent requirements in the standard system. We don't use characteristics-based forecasting.

Instead, we use our own BOM:

  • BOM usage P
  • No object dependencies
  • Frequencies are mapped using the corresponding base quantity and component quantities
  • BOM as part of a new production version

In the simulation in pMRP (initially inactive) dependent requirements of the components are determined according to the component quantities in the BOM.

These dependent requirements can be transferred to operative planning by releasing the simulation in pMRP. The simulative planned independent requirements of the header material aren't considered. They're inactive.

This figure explains the steps of the predictive MRP process when working with a Sales Order. The header material is connected the strategy P6, the assemblies and the items to strategy 70. At sales order level, independent requirements exist, and no consumption takes place. At item, level an exact clearing against dependent requirements from sales order takes place.

At assembly level, all further steps run in the same way as the strategy (25 for the header and 70 for assemblies).

Process Flow

This figure explains in detail the process flow of Predictive MRP. The following notes explain the steps in more detail.
  1. Assign strategy/strategy group P6 to the header material.
  2. Assign strategy/strategy group 70 to the material masters of the components. Change the Mixed MRP indicator and check the consumption.
  3. Create a BOM. BOM usage P, no object dependencies, and frequencies are mapped using the corresponding base quantity and component quantities.
  4. BOM as part of a new production version.
  5. Create PIRs in an inactive version.
  6. Create a simulation in pMRP.
  7. Release this simulation in pMRP. Copy the planned requirements of the components to an active version.
  8. (8), (9) Incoming sales orders for the finished product then lead to dependent requirements at assembly level. These are consumed by the planned requirements of the components from planning.

Useful Apps

App: Schedule pMRP Simulation Creation

This figure shows a screenshot of the app Schedule pMRP Simulation Creation

(1) Template Selection via top-level materials.

(2) Scheduling Options (default)

(3) Parameters:

  • ID + Description of Reference Data
  • ID + Description Simulation
  • Adjust Period Category (M) if necessary
  • Adjust Date Interval
  • Plant
  • Material
  • BOM usage P using selection ID 06 and priority 1
  • Consider Inactive PIRs with Version 00

App: Process pMRP Simulations

This figure shows a screenshot of the app Process (and Release) pMRP Simulations
  • Possibly check simulation views
  • Release Simulation. Here:
    • Create PIRs: Only subassembly components
    • Version 00
    • Version Active

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