How To Fix MM639 - Field & is lock-relevant and not changeable because material is locked

MM639 - Overview

• Message type: E = Error

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

• Message number: 639

• Message text: Field & is lock-relevant and not changeable because material is locked

What causes this issue?

The field &V1& 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, this field can no longer be changed and is not
ready for input.

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.

MM639 - Details

• The SAP error message MM639 indicates that a specific field in the material master record is lock-relevant and cannot be changed because the material is currently locked. This typically occurs when another user or process is editing the material master data, or when the material is in a state that prevents changes (e.g., it is being processed in a transaction).
  
  Cause:
  
  Material Locking: The material master record is locked by another user or transaction. This can happen if someone is currently editing the material or if a background job is processing it.
  Transaction State: The material may be in a state that does not allow changes, such as being part of a purchase order, production order, or other transactions.
  User Permissions: The user may not have the necessary permissions to change the material master data.
  
  
  Solution:
  
  
  Check for Locks:
  
  Use transaction code SM12 to check for locks on the material. Look for entries related to the material