How To Fix LB158 - You have already defined a ratio &1 / &2 for unit of measurement &

SAP Error Message - Details

• Message type: E = Error

• Message class: LB - Logistics: Batch - Management

• Message number: 158

• Message text: You have already defined a ratio &1 / &2 for unit of measurement &

What causes this issue?

You want to maintain a ratio for proportion or product units.
A ratio of &V1& per &V2& already exists for the unit of measurement.

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

System Response

The ratio &V3& per &V4& is not allowed for the same material.

How to fix this error?

Please correct your entries.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message LB158 - You have already defined a ratio &1 / &2 for unit of measurement & ?

  The SAP error message LB158 indicates that there is a duplicate definition of a conversion ratio for a specific unit of measurement (UoM) in the system. This typically occurs when you attempt to define a conversion factor for a UoM that has already been defined in the system.
  Cause:
  
  Duplicate Entry: You are trying to create a conversion ratio for a unit of measurement that already has an existing conversion ratio defined.
  Incorrect Data Entry: There may have been an error in data entry, leading to the same conversion being defined multiple times.
  Configuration Issues: The configuration settings for units of measurement may not be properly maintained, leading to conflicts.
  
  Solution:
  
  
  Check Existing Definitions:
  
  Go to the transaction code CUNI (Unit of Measure Conversion) in SAP.
  Look for the unit of measurement in question and check if the conversion ratio already exists.
  If it does, you can either modify the existing entry or delete it if it is incorrect.
  
  
  
  Modify or Delete Duplicate Entries:
  
  If you find a duplicate entry that is not needed, you can delete it.
  If the existing entry is correct, you may need to adjust your new entry to avoid the conflict.
  
  
  
  Review Configuration:
  
  Ensure that the configuration for units of measurement is correctly set up in the system.
  Check if there are any inconsistencies in the master data that could lead to this error.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on managing units of measurement and conversion factors.
  
  
  
  Seek Help from SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  CUNI: For managing units of measurement and their conversions.
  CUNI: To check and maintain unit of measure settings.
  
  
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  
  
  Documentation: Review SAP Help Portal for detailed information on units of measurement and conversion factors.
  
  
  By following these steps, you should be able to resolve the LB158 error and ensure that your unit of measurement definitions are correctly maintained in the SAP system.