Message type: E = Error
Message class: W0 - Customizing - ISR
Message number: 134
Message text: Old reference plant cannot be changed
Material master data exists for the old reference plant.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
You still have to use the old reference plant.
Error message extract from SAP system. Copyright SAP SE.
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
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