How To Fix D0764 - Namespace &* is already reserved for a lock object

SAP Error Message - Details

• Message type: E = Error

• Message class: D0 - Machine-level ABAP/4 Dictionary texts (e.g. debugging)

• Message number: 764

• Message text: Namespace &* is already reserved for a lock object

What causes this issue?

You tried to create an object for which further objects are generated
during activation. These genrated objects could be given the same name
as an exisitng lock object due to the naming convention.
To prevent this from happening, the object may not be created.

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

System Response

How to fix this error?

Choose another name.

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 D0764 - Namespace &* is already reserved for a lock object ?

  The SAP error message D0764 indicates that a namespace (in this case, represented by &*) is already reserved for a lock object. This typically occurs when there is an attempt to create a lock object with a namespace that is already in use or reserved for another lock object.
  Cause:
  
  Namespace Conflict: The specified namespace is already reserved for another lock object. In SAP, lock objects are used to manage concurrent access to data, and each lock object must have a unique namespace.
  Incorrect Naming: The naming convention for lock objects may not have been followed, leading to conflicts.
  Development Environment Issues: If multiple developers are working in the same environment, one developer may have already created a lock object with the same namespace.
  
  Solution:
  
  Check Existing Lock Objects: Use transaction code SE11 (Data Dictionary) to check for existing lock objects. Look for the lock object with the same name or namespace that you are trying to create.
  Choose a Different Namespace: If the namespace is already in use, consider using a different namespace for your lock object. Ensure that the new name adheres to the naming conventions.
  Delete or Modify Existing Lock Object: If the existing lock object is no longer needed, you may consider deleting it or modifying it if you have the necessary permissions. However, be cautious with this approach as it may affect other parts of the application.
  Consult Documentation: Review SAP documentation or guidelines regarding lock objects and namespaces to ensure compliance with best practices.
  
  Related Information:
  
  Lock Objects: Lock objects in SAP are used to prevent data inconsistencies by ensuring that only one user can modify a particular piece of data at a time.
  Naming Conventions: SAP has specific naming conventions for lock objects, typically starting with 'E' for exclusive locks and 'S' for shared locks.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE11 (Data Dictionary), SE80 (Object Navigator), and SE37 (Function Module) for managing lock objects and related development tasks.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis or development team for further assistance.