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Process documentationSupply and Demand Propagation Locate this document in the navigation structure

 

Supply and demand propagation in Supply Network Planning (SNP) is a means of implementing changes caused by constraints throughout your supply chain in search of a feasible solution to fulfill demands. The aim of constraint propagation in Supply Network Planning is to propagate changes in key figure values in time series throughout an entire time series network. It is therefore necessary that your planning is based on time series, and not orders, when you wish to use Supply and Demand Propagation. The Supply Network Planning relationships that reflect the dependencies between the key figures are used in propagation.

Propagation is not carried out infinitely. Instead, quantity restrictions, for example resource capacities, and time restrictions, such as transportation times and calendars, are taken into account. Taking into account such restrictions implies that, at times, only a portion of a given demand can be confirmed.

You use propagation in interactive planning in Supply Network Planning. For that reason, the propagation algorithm is very rapid. It propagates quantities by taking quota arrangements and priorities into account. Only SNP production process models are used with constraint propagation.

Unlike heuristic or optimization planning, supply and demand propagation does not consider lot sizes; that is, it does not use a rounding logic.

Caution Caution

Supply and Demand Propagation can only be used with time series liveCache. In productive systems, you should use this function only after consulting with SAP. For more information, see SAP Note 1284461.

End of the caution.

Prerequisites

You have created the items below in the following sequence:

  • Master planning object structure

    You can use the standard master planning object structure 9ASNPBAS, which is shipped with Advanced Planning and Optimization (APO), or create your own, keeping in mind that it should contain SNP characteristics only.

  • Storage buckets profile (if you are not using the planning area 9ASNP01)

    The storage buckets profile must contain all buckets that are later used in the planning buckets profile.

  • Planning area

    You can use the standard planning area 9ASNP01, which is shipped with APO, or create your own. You can combine key figures from SOP, SNP, and DP. You can also create your own key figures.

  • Master data

    You must create the products and locations and assign the location products to a model.

  • Planning area

    You also must activate the planning area for simulations.

  • Planning book

    You can use the standard planning book 9ASOP, which is shipped with APO, or create your own.

  • Macro

    You can create your own macros to flexibly control propagation.

  • You have defined your constraints as hard constraints in the planning area.

Process

The following is a simple step-by-step example of how to execute Supply and Demand Propagation:

  1. In the SAP Easy Access screen, you choose   Supply Network Planning   Planning   Supply and Demand Propagation  .

  2. On the Supply Network Planning desktop, you double-click a data view of the planning book.

  3. In the shuffler, you choose APO location product.

  4. You choose Enter.

  5. You double-click a location product in the list.

  6. As the constraint, you enter a value of the key figure 9ATSML0SXI (fixed warehouse receipt).

  7. As the demand, you enter a value in the key figure 9ATSML0LFO (forecast) in a later bucket.

  8. You choose Enter.

    Note Note

    This action causes propagation. Only the deliverable portion from the storage location (fixed receipt) is confirmed.

    End of the note.

  9. You choose Save to transfer the values from the simulation in interactive planning to liveCache.