How To Fix LB506 - Unit of measure &1 is superior to alternative unit &2

SAP Error Message - Details

• Message type: E = Error

• Message class: LB - Logistics: Batch - Management

• Message number: 506

• Message text: Unit of measure &1 is superior to alternative unit &2

What causes this issue?

You want to maintain the <DS:DE.LRMEI_WS>batch-specific unit of measure
</> &V1&. This is superior to the
<DS:GLOS.3526C0A4AFAB52B9E10000009B38F974>alternative unit of measure
</> &V2&. Alternative units of measure must not be converted to
batch-specific units of measure.

System Response

The unit of measure &V1& must not be used as a batch-specific unit of
measure.

How to fix this error?

Maintain a different <DS:DE.MESUB>lower-level unit of measure</> for
the alternative unit of measure &V2&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message LB506 - Unit of measure &1 is superior to alternative unit &2 ?

  The SAP error message LB506 indicates that there is a problem with the unit of measure (UoM) conversion in the context of inventory management or material management. Specifically, it means that the unit of measure you are trying to use (denoted as &1) is considered "superior" to the alternative unit of measure (denoted as &2). This typically occurs when the system is unable to convert between the two units of measure due to a configuration issue.
  Cause:
  
  Unit of Measure Configuration: The primary cause of this error is often related to the configuration of units of measure in the material master. The system expects a certain hierarchy or relationship between the units of measure, and if this is not correctly defined, the error will occur.
  Incorrect UoM Assignment: The unit of measure you are trying to use may not be correctly assigned as an alternative unit of measure for the material in question.
  Conversion Factor Issues: There may be issues with the conversion factors defined between the two units of measure, leading to the system being unable to perform the necessary calculations.
  
  Solution:
  
  
  Check Material Master Data:
  
  Go to the material master record (transaction code MM03) for the material in question.
  Check the "Units of Measure" view to ensure that both the base unit of measure and the alternative unit of measure are correctly defined.
  Ensure that the alternative unit of measure is set up correctly and that the conversion factors are defined properly.
  
  
  
  Review UoM Settings:
  
  Navigate to the configuration settings for units of measure (transaction code OME1 or OME2) to verify that the units are set up correctly.
  Ensure that the conversion factors between the units of measure are defined and that they make sense in the context of your business processes.
  
  
  
  Check for Hierarchical Relationships:
  
  Ensure that the unit of measure you are trying to use is not defined as a superior unit in the hierarchy. The system may have specific rules about which units can be used interchangeably.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on unit of measure configuration and troubleshooting.
  
  
  
  Testing:
  
  After making any changes, perform tests to ensure that the error no longer occurs and that the system behaves as expected.
  
  
  
  Related Information:
  
  Transaction Codes: MM03 (Display Material), MM02 (Change Material), OME1 (Maintain Units of Measure), OME2 (Define Conversion Factors).
  SAP Notes: Check SAP Notes for any known issues or patches related to unit of measure handling.
  User Roles: Ensure that you have the necessary authorizations to make changes to material master data and unit of measure settings.
  
  If the issue persists after checking these areas, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in material management.