How To Fix MM647 - The material type cannot be changed because the material is locked

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 647

• Message text: The material type cannot be changed because the material is locked

What causes this issue?

The material type has been defined as lock-relevant in Customizing for
the <LS>Material Master</> in <DS:SIMG.SIMG_CFMENUOLMSFIX>Define
Lock-Relevant Fields</>, and the material master record has been
locked. As a result, the material type cannot be changed.

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?

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 MM647 - The material type cannot be changed because the material is locked ?

  The SAP error message MM647 indicates that a material cannot be changed because it is currently locked. This typically occurs when there are ongoing transactions or processes that involve the material, preventing any modifications to its attributes, including its material type.
  Causes:
  
  Material Locking: The material is locked due to ongoing transactions, such as purchase orders, sales orders, or inventory movements.
  User Lock: A user may have locked the material for editing, preventing others from making changes.
  Background Jobs: There may be background jobs or batch processes that are currently using the material.
  Data Consistency Checks: The system may be performing data consistency checks that temporarily lock the material.
  
  Solutions:
  
  
  Check Lock Status:
  
  Use transaction code SM12 to check for any user locks on the material. If you find a lock that is no longer needed, you can delete it (if you have the necessary authorizations).
  
  
  
  Check Open Transactions:
  
  Review any open purchase orders, sales orders, or other transactions that