How To Fix LB507 - The already-defined altern. UoM &2 is to be assigned to characteristic &1

SAP Error Message - Details

• Message type: E = Error

• Message class: LB - Logistics: Batch - Management

• Message number: 507

• Message text: The already-defined altern. UoM &2 is to be assigned to characteristic &1

What causes this issue?

You wish to assign the unit of measure &V2& to characteristic &V1&. This
unit of measure has already been defined as an alternative unit.
You are using WM to pick deliveries. Open deliveries that have not yet
been picked or confirmed exist. These deliveries/shipments cannot be
processed further after conversion into a product unit of measure.

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?

Please confirm all picking-relevant shipments for this material.
To determine the open deliveries, please start the transaction
<DS:TRAN.VL06P>Outbound Deliveries for Picking (VL06P)</> and restrict
selection to 'WM Picking Only' and the material &V3& (all selection
criteria).
To determine the shipments still to be confirmed, please start the
transaction <DS:TRAN.VL06C>List of Outbound Deliveries to be Confirmed
(VL06C)</> and restrict selection to the material &V3& (all selection
criteria).

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 LB507 - The already-defined altern. UoM &2 is to be assigned to characteristic &1 ?

  The SAP error message LB507 indicates that there is an issue with the assignment of an alternative unit of measure (UoM) to a characteristic in the context of handling units or material management. Specifically, it suggests that the alternative unit of measure you are trying to assign to a characteristic is already defined elsewhere, which is causing a conflict.
  Cause:
  
  Duplicate Assignment: The alternative unit of measure (UoM) you are trying to assign to the characteristic is already assigned to another characteristic or material.
  Configuration Issues: There may be configuration settings in the material master or handling unit management that are not aligned with the intended use of the alternative UoM.
  Data Integrity Issues: There could be inconsistencies in the data that lead to this error, such as incorrect entries in the master data.
  
  Solution:
  
  
  Check Existing Assignments: 
  
  Go to the relevant transaction (e.g., MM03 for material master) and check the existing assignments of the alternative UoM to see where it is already being used.
  Ensure that the alternative UoM is not already assigned to another characteristic that conflicts with your current assignment.
  
  
  
  Modify or Remove Conflicting Assignments:
  
  If the alternative UoM is indeed assigned to another characteristic, you may need to either modify that assignment or remove it if it is no longer needed.
  Ensure that the alternative UoM is only assigned to one characteristic at a time.
  
  
  
  Review Configuration Settings:
  
  Check the configuration settings in the SAP system related to units of measure and handling units. Ensure that they are set up correctly according to your business requirements.
  
  
  
  Consult Documentation: 
  
  Review SAP documentation or help resources for specific guidance on handling units and alternative UoMs to ensure compliance with best practices.
  
  
  
  Contact SAP Support: 
  
  If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM03 (Display Material), MM02 (Change Material), and HUM-related transactions for handling units.
  Unit of Measure Configuration: Understand how units of measure are configured in SAP, including the definition of alternative units of measure in the material master.
  SAP Notes: Check for any SAP Notes related to error LB507 for additional insights or patches that may address the issue.
  
  By following these steps, you should be able to resolve the error message LB507 and successfully assign the alternative unit of measure to the desired characteristic.