How To Fix DT224 - Generic key is too long (>& bytes)

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 224

• Message text: Generic key is too long (>& bytes)

What causes this issue?

You want to buffer the table generically. The key length of the table,
i.e. the sum of the lengths of all the key fields of the table, is too
large for this type of buffering.

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?

The table cannot be generically buffered. Use full buffering (buffering
type X) or single-record buffering (buffering type P).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT224 - Generic key is too long (>& bytes) ?

  The SAP error message DT224, which states "Generic key is too long (>& bytes)," typically occurs when the length of a key used in a data structure exceeds the maximum allowed length defined by the system. This can happen in various contexts, such as when working with database tables, data elements, or structures that have a defined key length.
  Cause:
  
  Key Length Exceeded: The primary cause of this error is that the key being used exceeds the maximum length allowed for that particular data structure or database table.
  Data Model Design: Poorly designed data models or incorrect definitions of keys in custom tables or structures can lead to this issue.
  Data Migration: During data migration or data import processes, if the incoming data has keys that are longer than the defined limits, this error can occur.
  
  Solution:
  
  Check Key Length: Review the definition of the key in the relevant data structure or table. Ensure that the key length does not exceed the maximum allowed length.
  Modify Key Definition: If possible, modify the key definition to accommodate longer keys. This may involve changing the data type or length of the key fields in the database table or structure.
  Data Validation: Implement validation checks to ensure that the data being processed does not exceed the defined key length before attempting to save or process it.
  Review Custom Code: If the error occurs in custom ABAP code, review the code to ensure that it adheres to the key length restrictions.
  Consult Documentation: Refer to SAP documentation or notes related to the specific module or functionality you are working with for any additional guidance or best practices.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error. SAP frequently updates its knowledge base with solutions for common problems.
  Data Dictionary: Use transaction SE11 to check the data dictionary for the relevant tables and structures to understand their key definitions.
  Performance Considerations: Be mindful that changing key lengths can have performance implications, especially in large tables or when using indexes.
  Testing: After making changes, thoroughly test the affected functionality to ensure that the error is resolved and that no new issues have been introduced.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support or consulting with an experienced SAP developer or consultant for further assistance.