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Function documentationMRP-based DS: Collective Order Heuristic

 

You use this heuristic to create a link between orders in SAP APO based on the collective orders in the SAP ERP system.

Integration

You can interactively invoke this heuristic from the Start of the navigation path Detailed Scheduling Planning Board (Advanced Planning and Optimization Next navigation step Production Planning Next navigation step Interactive Production Planning Next navigation step Detailed Scheduling) End of the navigation path

If you want to run the heuristic in the background, choose Start of the navigation path Advanced Planning and Optimization Next navigation step Production Planning Next navigation step Automated Production Planning and Optimization Next navigation step Production Planning Run in the Background End of the navigation path.

Prerequisites

  • You have made the necessary heuristic settings in the activity Maintain Heuristics in the Customizing for Production Planning and Detailed Scheduling (PP/DS). The heuristic is supplied in standard Customizing as SAP_PP_MRPDS. You can choose from the following settings:

    • Ignore Purchase Orders and Purchase Requisitions

    • Ignore Wait and Move Times of Production Orders

    • Ignore Replication of Planned Orders

    • Ignore Wait and Move Times of Planned Orders

  • You have executed an MRP run for the collective orders.

  • You have transferred all orders to SAP APO using CIF.

Restrictions

  • Restrictions detailed in the OSS note 698427Information published on SAP site are applicable to this heuristic.

  • Since an RFC is used to read data from the SAP ERP system, the heuristic is performance-intensive.

  • The orders in the network formed by the collective orders is rescheduled only based on the strategy setting Consideration of Fixed Pegging Relationships. This means the system only schedules or reschedules an object so that the availability date/time is as punctual as possible, or at least lies before the requirements date/time.

Features

This heuristic creates fixed pegging relationships between orders in SAP APO based on those in SAP ERP. You can execute this heuristic on a product, a planned order, or a production order, where the planned order or production order is part of a collective order. You can invoke the heuristic either interactively or in the background.

This heuristic also considers the buffer times (move time and wait time) that exist between operations of the related orders in a collective order. Each order in this collective order has its own order number.

You can set indicators to define if the heuristic must ignore buffer times for planned orders and production orders.

Note Note

If subassemblies are produced directly for superior orders that lie within a production process, without physically entering the warehouse, then it is useful to have collective orders.

For example, if you change the order quantity in an order, the relevant quantity changes are made in the dependent orders automatically.

End of the note.

Activities

On execution of the heuristic, the system carries out the following steps:

  1. Based on the logical system, the heuristic reads collective order data from the corresponding SAP ERP system. It checks if the planned orders and production orders exist in SAP APO. If the orders exist in SAP APO, then the algorithm executes on these orders.

  2. The heuristic creates fixed pegging relationships between the collective orders received from the SAP ERP system. The planning-related time interval of the input node (UNPLAN_OFFSET_VALUE) is updated with the maximum wait and move times. The planning offset (OFFSET_VALUE) is updated with the minimum wait and move times.

    Note Note

    If buffer times are changed in SAP ERP, you must execute the heuristic again for the new buffer times to be reflected in SAP APO.

    End of the note.

Example

  1. On the Detailed Scheduling Planning Board, ensure that the overall profile is SAP_MRPDS or its copy.

  2. On the main screen of the Detailed Scheduling Planning Board, from the Product Chart select an order or the product that has the top order in the order network.

  3. Execute the heuristic by choosing Start of the navigation path Functions Next navigation step Heuristics Next navigation step MRPDS: Collective Order Heuristic End of the navigation path. Logs are generated for successful or unsuccessful executions.

  4. The system creates fixed pegging relationships for the collective orders as shown below. When the collective orders are replicated in SAP APO using CIF, a multilevel fixed pegging relationship exists between the production order or the planned order of the preceding orders and the dependent demands.

    When the heuristic is executed, the collective orders are read from SAP ERP through the RFC connection and the fixed pegging is carried out between dependent demands and the related orders.

  5. The system replicates buffer times as shown in the figure below. The planning-related offset and planning offset values of the input node of production orders and planned orders are filled with values as shown below.