Substitution Preselection Settings

Use

To activate the preselection of suitable substitutions (substitution preselection), you must make the following settings:

When assigning a rule strategy or rule strategy sequence , set the Preselectn indicator.
Make all of the settings for the rule-based availability check that are necessary to determine rules. If you want to influence rule determination as part of substitution preselection, select the Preselect field in the field catalog.

Recommendation
To determine a substitution list, during substitution preselection, the system evaluates all substitutions in all the determined rules. This can have a negative effect on performance. To improve performance, we recommend that you use rules with few substitutions for substitution preselection.

End of the recommendation.
In the check instructions, select one of the following values for substitution preselection:
- Preselection Active
- Preselection Can Be Switched On Externally
  
  When you select this value, you can trigger substitution preselection from the OLTP system.
  - Trigger substitution preselection from SAPCRM
    
    In SAP Customer Relationship Management (SAPCRM), assign the requirements profile from the global ATP check to the item categories.
    
    In the requirements profile, set the Preselection indicator. For more information, see the Implementation Guide (IMG) for SAP SCM under Advanced Planning and Optimization Global Available-to-Promise (Global ATP) General Settings Maintain Requirements Profile .
    
    On the initial screen for the simulative ATP check , set the Substitution Presel. Active indicator.
  - Trigger substitution preselection from a different OLTP system
    
    Select the Preselct. field in the field catalog of the OLTP system.
    
    For more information, see the Implementation Guide (IMG) for SAP Supply Chain Management (SAP SCM) under Advanced Planning and Optimization Global Available-to-Promise (Global ATP) General Settings Maintain Check Instructions.