How To Fix MM649 - The material cannot be unlocked when you extend it using a reference

MM649 - Overview

• Message type: E = Error

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

• Message number: 649

• Message text: The material cannot be unlocked when you extend it using a reference

What causes this issue?

You are extending a material using a reference material, and want to
unlock the material you are extending. This is not possible.

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?

Finish extending the material and save it.
Access the transaction <LS>Change Material</> and unlock the material
there.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

MM649 - Details

• The SAP error message MM649, which states "The material cannot be unlocked when you extend it using a reference," typically occurs when you are trying to extend a material master record using a reference material, but the system is unable to unlock the material for the extension process. This can happen for several reasons, and understanding the cause is essential for finding a solution.
  Causes:
  
  
  Material Status: The material you are trying to extend may have a status that prevents it from being modified or extended. This could be due to it being blocked for purchasing, sales, or other reasons.
  
  
  Locking Mechanism: The material might be locked by another user or process. SAP uses a locking mechanism to prevent simultaneous changes to the same data.
  
  
  Reference Material Issues: The reference material you are using may also have issues, such as being locked, having a status that prevents extension, or not being set up correctly.
  
  
  Authorization