How To Fix VHUAP251 - Reassigning HUs to different documents not possible here

VHUAP251 - Overview

• Message type: E = Error

• Message class: VHUAP - Messages for Packing Transaction Applications (FGrp VHUDIAL)

• Message number: 251

• Message text: Reassigning HUs to different documents not possible here

What causes this issue?

You are trying to change the reference of a handling unit.

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

System Response

It is not possible to change assignments using this function.

How to fix this error?

Use the function Change reference in order to change the reference to
the handling unit. You can choose between:
The reference to another sales order
The reference to another stock transport order
The reference to another delivery

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 VHUAP251 - Reassigning HUs to different documents not possible here ?

  Certainly! Here's a detailed explanation for the SAP error message VHUAP251: "Reassigning HUs to different documents not possible here":
  
  Error Message:
  VHUAP251 - Reassigning HUs to different documents not possible here
  
  
  Cause:
  This error occurs when you try to reassign Handling Units (HUs) that are already assigned to a particular document (such as a delivery, transfer order, or warehouse task) to a different document in a process or transaction where such reassignment is not allowed.
  In SAP Extended Warehouse Management (EWM) or Warehouse Management (WM), Handling Units are often linked to specific warehouse documents to ensure traceability and consistency. The system restricts reassigning HUs to different documents in certain scenarios to avoid inconsistencies in inventory and warehouse processes.
  Typical causes include:
  
  Attempting to move or reassign HUs that are already confirmed or partially processed in a warehouse task or delivery.
  Trying to reassign HUs in a transaction or process step that does not support HU reassignment.
  The HU is