How To Fix 28117 - Restriction not possible: expression not linear

28117 - Overview

• Message type: E = Error

• Message class: 28 - Configuration

• Message number: 117

• Message text: Restriction not possible: expression not linear

What causes this issue?

You can only use formulas to restrict a numeric characteristic if the
formula in the characteristic you want to restrict is linear.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 28117 - Restriction not possible: expression not linear ?

  The SAP error message 28117, "Restriction not possible: expression not linear," typically occurs in the context of SAP's optimization tools, such as SAP APO (Advanced Planning and Optimization) or SAP IBP (Integrated Business Planning). This error indicates that the system encountered a non-linear expression when it expected a linear one, which is necessary for certain types of optimization problems.
  
  Cause:
  
  Non-linear Expressions: The most common cause of this error is the presence of non-linear mathematical expressions in the model. This can happen if you are trying to apply restrictions or constraints that involve products, powers, or other non-linear operations.
  Incorrect Model Setup: If the model is not set up correctly, such as using variables or parameters that are not compatible with linear programming, this error can occur.
  Data Issues: Sometimes, the data being used in the model may lead to non-linear relationships, especially if there are multiplicative factors or ratios involved.
  
  
  Solution:
  
  Review Expressions: Check the