How To Fix L3420 - Currently, only handling units for deliveries can be moved

L3420 - Overview

• Message type: E = Error

• Message class: L3 -

• Message number: 420

• Message text: Currently, only handling units for deliveries can be moved

What causes this issue?

The system could not find a <GL:delivery>delivery</> for this
<GL:handling_unit>handling unit</>. It is likely that it has already
been packed for transportation.
The handling unit must be packed either for a
<GL:shipping_notification>shipping notification</> or a delivery.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message L3420 - Currently, only handling units for deliveries can be moved ?

  The SAP error message L3420, "Currently, only handling units for deliveries can be moved," typically occurs in the context of handling units (HUs) and inventory management within the SAP system. This error indicates that the system is trying to perform an operation (like moving or transferring a handling unit) that is not allowed for the current context, which is usually related to the type of document or the status of the handling unit.
  
  Cause:
  
  Incorrect Document Type: The operation you are trying to perform is only valid for handling units associated with deliveries. If you are trying to move handling units that are not linked to a delivery (e.g., stock transfer orders, production orders), this error will occur.
  Status of Handling Unit: The handling unit may be in a status that does not allow it to be moved. For example, if the handling unit is already in a process that locks it for