How To Fix L3A020 - Blocking logic must be set to B for active Handling Unit Management

SAP Error Message - Details

• Message type: E = Error

• Message class: L3A - Messages on Transfer Order Kernel

• Message number: 020

• Message text: Blocking logic must be set to B for active Handling Unit Management

What causes this issue?

Processing of handling units in Warehouse Management demands that lock
logic 'B' is set for maximum parallell processing for the storage
number.

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?

Change the lock logic for the storage number in Customizing.

Procedure for System Administrators

In Customizing, choose the activity <DS:SIMG.SIMG_CFMENUOLMLOML1>Define
control parameters for the storage number</> and change the
<DS:DE.LVS_ENQUE>method</> to 'B' in the detail screen in the lock logic
area.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message L3A020 - Blocking logic must be set to B for active Handling Unit Management ?

  The SAP error message L3A020 indicates that there is an issue with the configuration of the Handling Unit Management (HUM) in your SAP system. Specifically, it states that the blocking logic must be set to B (for blocking) for active Handling Unit Management.
  Cause:
  This error typically arises when the system is configured to use Handling Unit Management, but the blocking logic is not set correctly. The blocking logic is a setting that determines how the system handles the blocking of handling units during various processes, such as goods movements or inventory management.
  Solution:
  To resolve this error, you need to ensure that the blocking logic is set to B for the relevant configuration. Here are the steps to do this:
  
  
  Access Customizing:
  
  Go to the SAP Easy Access screen.
  Navigate to the following path: 
  Logistics Execution -> Handling Unit Management -> Basic Settings -> Define Blocking Logic
  
  
  
  
  Check Blocking Logic:
  
  In the configuration screen, look for the setting related to blocking logic.
  Ensure that the blocking logic is set to B (blocking) for the relevant handling unit types.
  
  
  
  Save Changes:
  
  After making the necessary changes, save your configuration.
  
  
  
  Test the Configuration:
  
  After saving, perform the operation that previously triggered the error to ensure that the issue has been resolved.
  
  
  
  Related Information:
  
  Handling Unit Management (HUM): This is a feature in SAP that allows for the management of handling units, which are physical units that can contain one or more products. Proper configuration is essential for effective inventory management and logistics operations.
  Blocking Logic: This setting is crucial for determining how the system handles inventory and stock movements. It can affect various processes, including goods receipt, goods issue, and stock transfers.
  SAP Notes and Documentation: If you continue to experience issues, consider checking SAP Notes or the official SAP Help Portal for additional guidance or updates related to HUM and blocking logic.
  
  If you are not familiar with making these changes, it may be advisable to consult with your SAP Basis or configuration team to ensure that the changes are made correctly and do not affect other processes in your SAP environment.