How To Fix COM_PME_PARSER117 - Restriction not possible: expression not linear

SAP Error Message - Details

• Message type: E = Error

• Message class: COM_PME_PARSER - 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 COM_PME_PARSER117 - Restriction not possible: expression not linear ?

  The SAP error message COM_PME_PARSER117 with the description "Restriction not possible: expression not linear" typically occurs in the context of SAP's optimization and planning tools, such as SAP Integrated Business Planning (IBP) or SAP Advanced Planning and Optimization (APO). This error indicates that the system encountered a non-linear expression when it expected a linear one, which is a requirement for certain types of optimization problems.
  Cause:
  
  Non-linear Expressions: The error arises when the model includes non-linear constraints or objective functions. Linear programming requires that all relationships be linear, meaning they can be expressed in the form of a straight line (e.g., ( ax + by = c )).
  Complex Calculations: If you are using complex calculations or functions (like multiplication of decision variables, powers, or other non-linear functions), the optimizer cannot process these as linear constraints.
  Incorrect Model Setup: Sometimes, the model may be incorrectly set up, leading to unintended non-linear expressions.
  
  Solution:
  
  Review Expressions: Check the expressions in your model to ensure they are linear. Look for any multiplications of decision variables or other non-linear operations.
  Simplify Constraints: If possible, simplify the constraints or objective functions to ensure they are linear. This may involve breaking down complex calculations into simpler, linear components.
  Use Linear Approximations: If you must use non-linear relationships, consider using linear approximations or piecewise linear functions if supported by your version of SAP.
  Model Configuration: Ensure that the model is configured correctly and that all necessary parameters are set to allow for linear optimization.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on formulating linear models in the context of the tool you are using.
  
  Related Information:
  
  SAP Notes and Knowledge Base Articles: Check SAP's support portal for any notes or articles related to this error message. There may be specific patches or updates that address known issues.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed. Other users may have encountered the same error and found solutions.
  Training and Documentation: Consider reviewing training materials or documentation related to the specific SAP module you are using, as they often provide best practices for model formulation.
  
  If the problem persists after trying these solutions, it may be beneficial to reach out to SAP support for further assistance, providing them with details about your model and the specific context in which the error occurs.