How To Fix CPE242 - Conversion rule &1 does not support UoM substitution

SAP Error Message - Details

• Message type: E = Error

• Message class: CPE - Commodity Pricing Engine

• Message number: 242

• Message text: Conversion rule &1 does not support UoM substitution

What causes this issue?

Conversion Rule &V1& was chosen for Conversion Place &V2&. This
Conversion Place is used to substitute the unit of measurement (UoM).
Conversion Rule &V1&, however, uses Conversion Routine &V3& which does
not support UoM substitution.

System Response

Conversion Rule &V1& cannot be used for Conversion Place &V2&.

How to fix this error?

Choose a Conversion Rule from the F4 help.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CPE242 - Conversion rule &1 does not support UoM substitution ?

  The SAP error message CPE242, which states "Conversion rule &1 does not support UoM substitution," typically occurs in the context of unit of measure (UoM) conversions in SAP, particularly when dealing with material master data, sales orders, or inventory management.
  Cause:
  The error is triggered when the system attempts to perform a unit of measure conversion using a conversion rule that does not allow for the substitution of units. This can happen in several scenarios, such as:
  
  Incorrect Configuration: The conversion rule defined in the system does not support the specific units of measure being used.
  Missing Conversion Rules: There may be no conversion rule defined for the specific UoMs involved in the transaction.
  Incompatible UoMs: The UoMs being used may not be compatible with the conversion rules set up in the system.
  Data Entry Errors: Incorrect data entry in the material master or transaction data can lead to this error.
  
  Solution:
  To resolve the CPE242 error, you can take the following steps:
  
  
  Check Conversion Rules:
  
  Go to the transaction code CUNI (Unit of Measure Conversion) to review the conversion rules defined in the system.
  Ensure that the conversion rule for the specific UoMs involved is correctly set up and allows for substitution.
  
  
  
  Define Missing Conversion Rules:
  
  If the required conversion rule does not exist, you may need to create it. Ensure that the conversion factors and the units of measure are correctly defined.
  
  
  
  Review Material Master Data:
  
  Check the material master data for the materials involved in the transaction. Ensure that the UoMs are correctly defined and that the conversion rules are properly assigned.
  
  
  
  Check UoM Settings:
  
  Verify the settings for the units of measure in the system. Ensure that the UoMs are compatible and that the necessary conversion factors are in place.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on unit of measure conversions and related configuration.
  
  
  
  Testing:
  
  After making changes, perform a test transaction to ensure that the error no longer occurs.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  CUNI - Unit of Measure Conversion
  MM02 - Change Material Master
  MM03 - Display Material Master
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to UoM conversions.
  User Roles: Ensure that you have the necessary authorizations to make changes to conversion rules and material master data.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in material management or logistics.