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 Running the Preparation Service for LI-Based Forecasting

Purpose

To run the leading-indicator-based (LI-based) forecast for a location product, you must first execute the planning service SPP: Prep. Srvce for LI-Based Fcsting (SPP_LFI_SERVICE). This planning service generates the demand history for the leading indicator for all products of the product selection of the Planning Service Manager and determines the historical data for the coefficient.

Process

  1. The preparation service for leading-indicator-based forecasting checks all products of the product selection as to whether they are part of a supersession . If a product is part of a supersession, the preparation service checks whether the supersession is a one-to-one replacement. It is only in this case that the preparation service takes into account this supersession in leading-indicator-based forecasting. The preparation service for leading-indicator-based forecasting of the predecessor and successor product then generates a demand history as described below.

  2. The preparation service checks whether you have set the Read BOM of LI flag in the service profile for the preparation service.

    • If you have set this flag, the system reads all equipment BOMs from the ERP system and checks how often a product occurs in which equipment BOMs.

    • If you have not set this flag, the system sets an equipment equal to a product.

      For more information, see the Implementation Guide (IMG) for Advanced Planning and Optimization under Supply Chain Planning -> Service Parts Planning (SPP) -> Forecasting -> Define Forecast Service Profiles .

  3. The preparation service checks whether you have restricted your equipment with a selection in Customizing under Start of the navigation path Define Leading Indicators Next navigation step Selection option End of the navigation path , or whether you want to take into account all equipment in leading-indicator-based forecasting. If you want to restrict the equipment taken into account in leading-indicator-based forecasting, you can define an equipment selection in Customizing. You can specify the semantics and values or value ranges for these semantics that the system is to take into account or not take into account in the selection here.

    Example Example

    Enter the semantic ABC indicator and value A . In this case, the system only takes into account equipment with ABC indicator A.

    End of the example.

    For more information, see the IMG for Advanced Planning and Optimization under Supply Chain Planning -> Service Parts Planning (SPP) -> Forecasting -> Define Leading Indicators .

  4. The preparation service determines an entry location for all products of the product selection and checks, which leading indicator group you have assigned to this entry location. The system only performs step 5 for those leading indicators that are included in this leading indicator group.

    Note Note

    To increase performance, assign as few leading indicators as possible to each leading indicator group.

    End of the note.

  5. If the Installed Base leading indicator occurs in your leading indicator group, the preparation service distinguishes between the Installed Base leading indicator and all other leading indicators as follows:

    • Installed Base leading indicator:

      1. The preparation service determines the demand history of the Installed Base leading indicator from the information from step 2. To do so, it counts how often a product occurs in total in all checked equipment BOMs. If you are not using equipment BOMs and an equipment corresponds to a product, the system only counts the equipment.

      2. The preparation service determines the first stockholding locations for the products. To do so, it determines at which location the demand for the equipment occurred. If this location is a stockholding location, it determines this location as the first stockholding location. If this location is not a stockholding location, it goes up in the BOD until it finds a stockholding location and determines this location as the first stockholding location.

        If you want to define your own logic or wish to use the ATP check for determining the first stockholding location, you can implement the business add-in (BAdI) BAdI: Determine First Stockholding Location for Leading-Indicator-Based Forecasting (/SAPAPO/EQUIP_FIRST_STOCK_PREP). For more information, see the IMG for Advanced Planning and Optimization under Start of the navigation path Supply Chain Planning Next navigation step Service Parts Planning (SPP) Next navigation step Business Add-Ins (BAdIs) for Service Parts Planning (SPP) Next navigation step BAdIs for Forecasting End of the navigation path .

        An example of how the preparation service generates the demand history for the leading indicator Installed Base is available under Example 1 for the Preparation Service for Leading-Indicator-Based Forecasting .

    • Other leading indicators

      1. The preparation service determines the first stockholding locations for the products. To do so, it checks in which equipment the product occurs and then proceeds as described in step ii under Installed Base Leading Indicator.

      2. For each combination of product and location, the preparation service reads the requested leading from the InfoCube SPP: Installed Base Key Figures ( 9AIBASKF ).

        An example of how the preparation service generates the demand history for the leading indicator Number of Uses is available under Example 2 for the Preparation Service for Leading-Indicator-Based Forecasting .

  6. For all products, which the preparation service has determined as part of a one-to-one supersession in step 1, it checks how often the predecessor product is included in the successor product in the product supersession master data. It then multiplies the leading indicator values of the predecessor product for each period by this factor and adds these values to the leading indicator values of the successor product.

  7. The preparation service aggregates the values of the demand history for the leading indicator along the BOD.

  8. The preparation service generates the demand history for the coefficient. To do so, it divides the values of the key figure Demand: Final History of the spare parts by the values of the demand history of the leading indicator and thus determines the failure rate.