How To Fix MC266 - Could not create pool & in ABAP Dictionary

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 266

• Message text: Could not create pool & in ABAP Dictionary

What causes this issue?

The physical matchcode IDs (update types A, S, and P) for a matchcode
object are stored in a pool. This pool is automatically stored in the
ABAP Dictionary when the matchcode object is generated. The name of the
pool is formed from the prefix M_ and the name of the matchcode object.
In this case, the creation of the pool was not successful - for example,
because another pool already exists with the name chosen as standard.

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?

Try to get further information about the error using the activation
logs.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC266 - Could not create pool & in ABAP Dictionary ?

  The SAP error message MC266, which states "Could not create pool & in ABAP Dictionary," typically occurs when there is an issue with the creation of a database pool in the ABAP Dictionary. This can happen for several reasons, and understanding the cause is essential for finding a solution.
  Causes of Error MC266
  
  
  Database Issues: The underlying database may have issues, such as being down, misconfigured, or having insufficient resources (like disk space).
  
  
  Authorization Problems: The user may not have the necessary authorizations to create database objects in the ABAP Dictionary.
  
  
  Naming Conflicts: There may be a naming conflict with existing database objects, such as tables or views.
  
  
  Technical Settings: Incorrect technical settings for the database table or pool can lead to this error.
  
  
  Transport Issues: If the object is being transported from one system to another, there may be issues with the transport request.
  
  
  Database Connection: Problems with the database connection settings in the SAP system can also lead to this error.
  
  
  Solutions to Error MC266
  
  
  Check Database Status: Ensure that the database is up and running. Check for any database-related errors or logs.
  
  
  Review Authorizations: Verify that the user has the necessary authorizations to create database objects. You may need to consult with your SAP security team.
  
  
  Check Naming Conflicts: Ensure that the name you are trying to use for the pool does not conflict with existing objects. You can check the database for existing tables or views with the same name.
  
  
  Review Technical Settings: Go to the technical settings of the database table or pool you are trying to create and ensure that they are correctly configured.
  
  
  Check Transport Requests: If the object is being transported, check the transport logs for any errors or issues that may have occurred during the transport process.
  
  
  Database Connection Settings: Verify the database connection settings in the SAP system. Ensure that the connection parameters are correct and that the system can communicate with the database.
  
  
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates available that resolve the issue.
  
  
  System Logs: Review the system logs (transaction SM21) for any additional error messages or warnings that could provide more context about the issue.
  
  
  Related Information
  
  Transaction Codes: You may use transaction codes like SE11 (ABAP Dictionary) to check the definitions of database objects and SE14 (Database Utility) to manage database objects.
  SAP Community: The SAP Community forums can be a valuable resource for finding similar issues and solutions shared by other users.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if it is a production system.
  
  By following these steps, you should be able to identify the cause of the MC266 error and implement a solution to resolve it.