Sequence-Dependent Lot-Size Planning

For optimization-based planning (see Optimization-Based Planning) in Supply Network Planning (SNP), you can specify that the system considers sequence-dependent lot-size planning. This allows the SNP optimizer to optimize the setup costs. First of all, you define setup transitions, setup costs, and setup times in a setup matrix. The SNP optimizer then takes this data into account and determines the solution with the lowest costs.

An order sequence number is displayed for the SNP planned orders in the detail view of interactive SNP planning and in the optimization results log. The SNP optimizer uses the order sequence numbers to generate proposals for block planning in Production Planning and Detailed Scheduling (PP/DS).

Prerequisites

In order that the SNP optimizer can optimize the setup costs, the following prerequisites must have been met:

You have created setup groups. To do so, on the SAP Easy Access screen, choose Advanced Planning and Optimization Master Data Application-Specific Master Data Production Planning Setup Group/Setup Matrix Maintain Setup Groups .
Alternatively, you can transfer the setup groups from a connected ERP system to SAP SCM. For more information, see SAP Library at http://help.sap.com under SAP Business Suite SAP Supply Chain Management SAP SCM 7.0 SAP Advanced Planning and Optimization (SAP APO) Production Planning and Detailed Scheduling (PP/DS) PP/DS Process Interactive Planning Detailed Scheduling Topics Detailed Scheduling Setup Matrix Integration of Setup Groups .

The production data structure (PDS) used must contain a setup group. If you have transferred setup groups from the ERP system and have specified a setup group in the routing, they are automatically transferred to the relevant PDS. The function supports PDS only. In other words, production process models (PPMs) are not supported. PDS that were created using iPPE are not supported either.
You have defined the setup statuses, setup transitions and the corresponding setup costs and setup times in the setup matrix. To do this, on the SAP Easy Access screen, choose Advanced Planning and Optimization Master Data Application-Specific Master Data Production Planning Setup Group/Setup Matrix Maintain Setup Matrix .
Note that the SNP optimizer considers standard setup transitions only. In other words, it does not consider exception setup transitions. For more information, see SAP Library at http://help.sap.com under SAP Business Suite SAP Supply Chain Management SAP SCM 7.0 SAP Advanced Planning and Optimization (SAP APO) Master Data Application-Specific Master Data Master Data for Production Planning Setup Matrix .
You have specified the setup matrix in the master data of a single-mixed resource or a bucket resource on the Time-Cont. Capacity tab page. Other resource types are not supported.
You have set the PerLotSize indicator for the resource to Sequence-Dependent Lot-Size Planning on the SNP Bucket Cap tab page.
A PDS can use only one resource for which this indicator has been set.

A PDS must not exceed any planning period (bucket) within the defined time period for sequence-dependent lot size planning.
In the SNP optimizer profile, you have selected Discrete Optimization as the optimization method and, in the Sequence-Dependent Lot Size field on the Discrete Constraints tab page, you have specified a time period in which the SNP optimizer takes sequence-dependent lot sizes into account.
The PDSs that run on sequence-dependent resources must not exceed any planning period (bucket).

If you want the SNP optimizer to generate proposals for blocking planning in PP/DS, the following prerequisites must also be met:

You have activated block planning in Customizing for SNP under Basic Settings Maintain Global SNP Settings . This is also a prerequisite for displaying information about the blocks in the detail view of interactive SNP planning.

Features

Sequence-Dependent Lot-Size Planning

The sequence-dependent lot-size planning function offers the following:
The SNP optimizer considers the setup transitions, setup costs, and setup times that you defined in the setup matrix.
The SNP optimizer checks the setup groups of the production data structures used and determines the optimum sequence of PDS and created planned orders on the basis of costs.
The setup costs are displayed in the planning result of optimization in both interactive SNP planning and in the optimization results log.
The sequence number of the order is displayed for the SNP planned orders in the detail view of interactive SNP planning and in the optimization results log.

Block Planning

The SNP optimizer uses the order sequence numbers to generate proposals for block planning in PP/DS. These proposals can be loaded to PP/DS. For more information, see the SAP Help Portal at http://help.sap.com under Start of the navigation path SAP Business Suite Next navigation step SAP Supply Chain Management SAP SCM 7.0 SAP Advanced Planning and Optimization (SAP APO) Production Planning and Detailed Scheduling (PP/DS) Planning with Characteristics Functions for Block Planning Downloading of SNP Blocks End of the navigation path .

In SNP, planned orders are combined to form blocks. Since these SNP blocks deviate from the PP/DS blocks, some of the prerequisites described in the PP/DS documentation mentioned above must be met.

In the detail view of interactive SNP planning, you can display the start and end dates and times of the blocks for the planned orders. If you select a planned order in the detail view and choose Block View, the system displays all the orders belonging to a block, together with the relevant detailed information. You can use Bucket View to switch back to the normal detail view.

Activities

You run the SNP optimizer in interactive SNP planning or in the background. For more information, see Running the Optimizer from the Interactive Planning Desktop and Running the Optimizer in the Background.

You then display the results in interactive SNP planning.