How To Fix DI804 - Lock mode & for table & is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: DI - Dictionary messages: Indexes

• Message number: 804

• Message text: Lock mode & for table & is not allowed

What causes this issue?

Only the values 'E' (= Exclusive), 'S' (=Shared), 'X' (=Exclusive, not
cumulative) and ' ' (= do no lock) are allowed for the
<DS:TX.DDDOK_ENQU_MODE>lock mode</> of a base table in a lock object.
In the current lock object, however, another lock mode is maintained
for a base table.

System Response

The action was cancelled.

How to fix this error?

Check in the maintenance transaction of the ABAP/4 Dictionary that all
base tables have an allowed lock mode.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DI804 - Lock mode & for table & is not allowed ?

  The SAP error message DI804 typically indicates that there is a lock mode issue with a specific table in the database. This error occurs when an operation attempts to access a table in a way that is not permitted due to the current lock settings. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies when multiple users or processes try to access or modify the same data simultaneously. If a table is locked in a certain mode (e.g., exclusive lock), other operations that require a different lock mode (e.g., shared lock) will be blocked.
  Long-Running Transactions: If a transaction is taking too long to complete, it may hold locks longer than expected, causing other transactions to fail with this error.
  Incorrect Lock Mode: The operation being performed may require a different lock mode than what is currently set for the table.
  Database Configuration: Sometimes, the database configuration or settings may lead to unexpected locking behavior.
  
  Solution:
  
  Check Lock Status: Use transaction codes like SM12 (for lock entries) to check if there are any active locks on the table. Identify the user or process holding the lock.
  Release Locks: If you find unnecessary locks, you can manually delete them (if you have the necessary authorizations) or ask the user holding the lock to release it.
  Optimize Transactions: Review the transactions that are causing the locks. Optimize them to ensure they complete quickly and release locks promptly.
  Adjust Lock Settings: If applicable, review and adjust the locking settings in your application or database configuration to allow for the required lock modes.
  Consult Documentation: Refer to SAP documentation or notes related to the specific table and operation you are trying to perform for any known issues or recommendations.
  Contact Support: If the issue persists, consider reaching out to SAP support for further assistance, especially if it involves critical business processes.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to view locks), SM21 (to check system logs), and ST22 (for dumps) to diagnose issues.
  Database Locks: Understand the types of locks (shared, exclusive) and how they affect database operations.
  Performance Monitoring: Regularly monitor system performance and locking behavior to prevent future occurrences of this error.
  
  By following these steps, you should be able to identify the cause of the DI804 error and implement a solution to resolve it.