How To Fix VHUDLV021 - One HU already has a reference to a delivery

SAP Error Message - Details

• Message type: E = Error

• Message class: VHUDLV - Messages for Creation of Deliveries via HUs

• Message number: 021

• Message text: One HU already has a reference to a delivery

What causes this issue?

One of the HUs you have selected already has a reference to a delivery.

System Response

Since the HU is already reserved for a delivery, it cannot be included
in a different delivery.

How to fix this error?

If you want to include an HU with a reference to delivery A in delivery
B, you first need to change the reference from A to B by choosing
<zh>Change Reference</>.

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 VHUDLV021 - One HU already has a reference to a delivery ?

  The SAP error message VHUDLV021, which states "One HU already has a reference to a delivery," typically occurs in the context of handling units (HUs) in the SAP system. This error indicates that the handling unit you are trying to reference or assign to a delivery is already linked to another delivery. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Existing Reference: The handling unit (HU) you are trying to use is already assigned to a different delivery. In SAP, each HU can only be associated with one delivery at a time.
  Incorrect Processing: The error may arise if there is an attempt to reassign an HU that is still in use or has not been properly processed in the system.
  System Configuration: There may be specific configurations or settings in the system that restrict the movement or assignment of HUs.
  
  Solutions:
  
  
  Check Current Assignments:
  
  Use transaction codes like HU02 (Display Handling Unit) to check the current status and assignments of the handling unit. This will help you identify which delivery the HU is currently linked to.
  
  
  
  Unassign the HU:
  
  If the HU is incorrectly assigned, you may need to unassign it from the existing delivery. This can typically be done through the delivery document or handling unit management transactions.
  
  
  
  Use a Different HU:
  
  If the HU is legitimately assigned to another delivery and cannot be unassigned, consider using a different handling unit that is not currently in use.
  
  
  
  Review Delivery Process:
  
  Ensure that the delivery process is being followed correctly. If there are issues in the workflow, it may lead to such errors. Review the steps taken to create and manage deliveries and HUs.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on handling units and deliveries. This can provide insights into best practices and troubleshooting steps.
  
  
  
  Check for System Updates:
  
  Ensure that your SAP system is up to date with the latest patches and updates, as sometimes bugs or issues can be resolved through system updates.
  
  
  
  Related Information:
  
  Handling Units (HUs): HUs are used in SAP to manage logistics and inventory. They can represent physical items, pallets, or containers.
  Delivery Processing: Understanding the delivery process in SAP is crucial, as it involves various transactions and steps that can affect how HUs are managed.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as VL01N (Create Outbound Delivery), VL02N (Change Outbound Delivery), and HU02 (Display Handling Unit) for managing deliveries and HUs.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a technical consultant who can provide more in-depth assistance based on your specific system configuration and business processes.