Preparing Requirements Grouping (SAP Library - Material Requirements Planning (PP-MRP))

Preparing Requirements Grouping

Implementation Options

This process describes the sequence of preparations necessary in order to be able to use requirements grouping for planning projects, in addition to the master data that you have to maintain.

Prerequisites

For period lot sizes, such as MB (monthly lot size), you have set the indicator to 2 for Lot size as in planning horizon in the MTO lot size field, in Customizing for MRP, in the IMG activity Check lot-sizing procedure.

This causes the system to actually use the monthly lot size in the lot-size calculation for MRP in individual project planning, if you have entered MB into the material master. If you have not set this indicator, the planning run then creates a procurement proposal with lot-for-lot order quantity for every requirement in the segment of the MRP element.

Process Flow

You define how the individual materials are to be planned: with individual project planning, with requirements grouping, or as collective requirements in plant stock.

You create MRP groups for the materials. To do this, you choose the IMG activity Maintain all MRP areas in Customizing for MRP.

You select the MRP groups, for which you want to activate requirements grouping. For this, set the Grouping indicator in the IMG activity Activate requirements grouping for individual project planning in Customizing for MRP.

You maintain the MRP data in the material master records:

For the materials, which are meant for individual project planning such as finished products, you assign an MRP group, for which requirements grouping has not been activated.
For the materials, which are to be planned with requirements grouping, you assign an MRP group, for which requirements grouping has been activated. Enter a period lot size as the lot size, such as, for example, MB (monthly lot size) so that MRP combines the requirements of a material in a period according to the selected lot size strategy and creates a procurement proposal in the segment of the grouping WBS element.
For materials that are managed in the plant stock and are planned together, set the indicator to 2 for collective requirements only in the Individual/coll. field.

You create the BOMs for the finished product and assemblies. You use the material BOM for this.

You create a project definition for a grouping WBS element and select the Valuated stock field in it. For the project definition, you create a WBS element, for which you set the indicator 1 or 2 in the Grouping WBS element field.

You create a project definition and the appropriate WBS elements for the sales orders.

You create a network for each project, assign the project definition and a WBS element to the network and enter the necessary activities. You assign the required materials to the network operations.

You combine the WBS elements, whose materials are to be planned using requirements grouping, to a grouping WBS element. To do this, you assign the WBS elements to a grouping WBS element.

If a grouping WBS element is not to be used for all materials but rather for particular materials, you have to maintain the grouping WBS element’s area of validity. You do this by entering the plant when assigning the MRP groups.

You can find further information on WBS elements and networks in the SAP document PS – Project System under Work Breakdown Structure (WBS) and Network.