How To Fix CM_EXPERT304 - An error occurred when reading identifier &1 of specification &2

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_EXPERT - Messages for Expert

• Message number: 304

• Message text: An error occurred when reading identifier &1 of specification &2

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CM_EXPERT304 - An error occurred when reading identifier &1 of specification &2 ?

  The SAP error message CM_EXPERT304 indicates that there was an issue when trying to read a specific identifier of a specification in the SAP system. This error typically occurs in the context of SAP's Classification Management or Product Lifecycle Management (PLM) modules, where specifications and identifiers are crucial for managing product data.
  Cause:
  
  Missing Specification: The specification identified by &2 may not exist in the system.
  Incorrect Identifier: The identifier &1 may be incorrect or not associated with the specified specification.
  Authorization Issues: The user may not have the necessary permissions to access the specification or identifier.
  Data Corruption: There may be issues with the underlying data, such as corruption or inconsistencies in the database.
  Configuration Issues: There may be configuration problems in the classification or specification management settings.
  
  Solution:
  
  
  Verify Specification and Identifier:
  
  Check if the specification &2 exists in the system.
  Ensure that the identifier &1 is correctly associated with the specification.
  
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary authorizations to access the specification and identifier. This can be done by reviewing the user's roles and permissions.
  
  
  
  Data Consistency Check:
  
  Run consistency checks on the relevant data to identify any corruption or inconsistencies. This may involve using transaction codes like SE11 or SE16 to inspect the database tables.
  
  
  
  Review Configuration:
  
  Check the configuration settings related to classification and specifications to ensure they are set up correctly.
  
  
  
  Consult SAP Notes:
  
  Look for any relevant SAP Notes or patches that may address this specific error. SAP frequently releases updates that fix known issues.
  
  
  
  Contact SAP Support:
  
  If the issue persists after performing the above checks, consider reaching out to SAP Support for further assistance. Provide them with the error message details and any relevant logs.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes related to classification and specifications, such as CL02 (Change Class), CL03 (Display Class), and C202 (Display Specification).
  Documentation: Review SAP documentation on Classification Management and Product Lifecycle Management for more context on how specifications and identifiers are managed.
  User Forums: Check SAP community forums or user groups for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to diagnose and resolve the CM_EXPERT304 error in your SAP system.