How To Fix VL158 - Delivery does not allow the required change

VL158 - Overview

• Message type: E = Error

• Message class: VL -

• Message number: 158

• Message text: Delivery does not allow the required change

What causes this issue?

As the quantity of the inbound delivery was being checked against the
corresponding <DS:GLOS.purchase_order>purchase order</>, one of the
following errors occurred:
The purchase orders could not be found
An invalid purchase order was entered
Confirmation is not possible
The conversion is not allowed

How to fix this error?

Check the possible error sources.

Error message extract from SAP system. Copyright SAP SE.

VL158 - Details

• The SAP error message VL158 ("Delivery does not allow the required change") typically occurs when you attempt to make changes to a delivery document that are not permitted due to the current status of the delivery or the nature of the changes being made. This can happen in various scenarios, such as when trying to change the delivery quantity, shipping point, or other critical fields after the delivery has been processed or confirmed.
  Causes:
  
  Delivery Status: The delivery may be in a status that does not allow changes (e.g., it has been fully picked, packed, or shipped).
  Document Flow: If the delivery is linked to subsequent documents (like billing documents), changes may be restricted.
  Custom Settings: Custom configurations in the SAP system may restrict certain changes based on business rules.
  Incomplete Data: Required fields may not be filled out correctly, leading to restrictions on changes.
  
  Solutions:
  
  Check Delivery Status: Review the status of the delivery. If it