How To Fix VO201 - No longer possible to change unit

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message VO201 - No longer possible to change unit ?

  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 if the sales document or item has already been delivered or billed.
  Use transaction VA03 to display the sales order and check the item status tab.
  
  
  
  Reverse or Cancel Subsequent Documents:
  
  If delivery or billing documents exist, consider reversing or canceling them if business processes allow.
  After reversal, you may be able to change the unit of measure.
  
  
  
  Create a New Sales Document:
  
  If reversal is not possible or practical, create a new sales order with the correct unit of measure.
  
  
  
  Consult Business Process:
  
  Confirm with business users if changing the unit is necessary or if alternative solutions exist (e.g., create a new order or credit/debit adjustments).
  
  
  
  Technical Checks:
  
  Check if any user exits or BAdIs are restricting changes to the unit of measure.
  Review customizing settings in SD related to units of measure and document change rules.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  VA02 – Change Sales Order
  VA03 – Display Sales Order
  VL02N – Change Outbound Delivery
  VF02 – Change Billing Document
  
  
  
  SAP Notes:
  
  Search SAP Support Portal for notes related to message VO201 for specific system versions.
  
  
  
  Configuration:
  
  Units of measure are maintained in Logistics ? General ? Units of Measure.
  Check if alternative units are properly configured and conversion factors are correct.
  
  
  
  User Exits / BAdIs:
  
  Sometimes custom code restricts changes to units after certain statuses.
  
  
  
  
  Summary:
  VO201 error means the system prohibits changing the unit of measure because the sales document has progressed too far in processing. The solution involves checking document status, reversing subsequent documents if possible, or creating a new sales order with the correct unit. Always coordinate with business users before making changes that affect document flow.
  
  If you provide more details about the document type, status, or process step, I can help with more specific guidance.