How To Fix VO201 - No longer possible to change unit

VO201 - Overview

• Message type: E = Error

• Message class: VO - W&S: Rough workload forecast + picking wave

• Message number: 201

• Message text: No longer possible to change unit

What causes this issue?

You want to change the weight or volume unit. However, this is no
longer possible since workload data already exists in the databases.

System Response

The input is not accepted.

How to fix this error?

Use the function 'F12=Cancel' to end maintenance.
Delete or archive the data, and again call up the maintenance of the
control data.
If no more actual data exists, you can change the units.

Error message extract from SAP system. Copyright SAP SE.

VO201 - Details

• SAP Error Message:
  VO201 - No longer possible to change unit
  
  
  Cause:
  This error occurs when you try to change the unit of measure (UoM) for a sales document item, but the system does not allow it anymore. Typically, this happens because the sales document has already reached a processing stage where changing the unit is restricted. For example:
  
  The sales document item has already been partially or fully delivered.
  The document is in a status where changes to the unit of measure are locked (e.g., billing or delivery created).
  The unit of measure is linked to other dependent data (like pricing, conditions, or stock) that prevents changes.
  
  
  Explanation:
  In SAP SD (Sales and Distribution), the unit of measure for a sales document item is critical because it affects pricing, availability checks, delivery, and billing. Once the document progresses beyond certain points (e.g., delivery creation), changing the unit can cause inconsistencies or errors in downstream processes.
  
  
  Solution:
  
  
  Check Document Status:
  
  Verify