How To Fix W0134 - Old reference plant cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: W0 - Customizing - ISR

• Message number: 134

• Message text: Old reference plant cannot be changed

What causes this issue?

Material master data exists for the old reference plant.

System Response

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

How to fix this error?

You still have to use the old reference plant.

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 W0134 - Old reference plant cannot be changed ?

  SAP Error Message:
  
  W0134 - Old reference plant cannot be changed
  
  Cause:
  This warning message occurs when you attempt to change the Reference Plant field in a material master or related master data, but the system does not allow the change because the old reference plant is already assigned and cannot be modified. The reference plant is a key organizational element in SAP that links material data to a specific plant, and certain changes to it are restricted once set, especially if the material is already in use or has transactional data.
  
  Explanation:
  
  The Reference Plant is used in material master data to define the plant from which the material data is copied or referenced.
  Once the reference plant is set and the material master is created or used in transactions, changing this reference plant is generally not allowed.
  This restriction ensures data consistency and integrity across plants and related processes.
  
  
  Solution:
  
  
  Check if the material is already created with the reference plant:
  
  If the material master exists and has been used in transactions, you cannot change the reference plant.
  
  
  
  If you need to use a different reference plant:
  
  Create a new material master with the desired reference plant.
  Alternatively, maintain the material master data separately for each plant without changing the reference plant.
  
  
  
  If the change is absolutely necessary:
  
  It may require complex data migration or deletion of existing material master data and re-creation, which is generally not recommended.
  Consult with your SAP Basis or functional consultant before attempting any such changes.
  
  
  
  Review Customizing Settings:
  
  Sometimes, the system behavior can be influenced by configuration in the material master or plant settings.
  Check if any user exits or BAdIs are enforcing this restriction.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:  
  
  MM01 (Create Material)  
  MM02 (Change Material)  
  MM03 (Display Material)
  
  
  
  SAP Notes:  
  
  Check SAP Notes related to material master and reference plant changes for any updates or patches.
  
  
  
  SAP Help Portal:  
  
  Refer to SAP documentation on material master and plant-specific data.
  
  
  
  Best Practice:  
  
  Avoid changing the reference plant after material creation. Plan the reference plant carefully during material master creation.
  
  
  
  
  If you provide the exact transaction or scenario where this error occurs, I can help with more specific guidance.