How To Fix DT491 - Could not determine structure width of &

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 491

• Message text: Could not determine structure width of &

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DT491 - Could not determine structure width of & ?

  The SAP error message DT491, which states "Could not determine structure width of &," typically occurs when the system is unable to determine the width of a data structure or table. This can happen in various contexts, such as when working with data dictionary objects, ABAP programs, or during data processing tasks.
  Causes:
  
  Missing Data Element or Structure: The structure or data element referenced in the program or transaction may not exist or may not be properly defined in the Data Dictionary.
  Inconsistent Data Dictionary: There may be inconsistencies or issues in the Data Dictionary, such as missing or incomplete definitions.
  Transport Issues: If the object was transported from one system to another, it may not have been transported correctly, leading to missing definitions.
  Authorization Issues: Lack of proper authorizations to access the data structure or its components can also lead to this error.
  Incorrect Program Logic: The ABAP code may be trying to access a structure that is not defined in the current context.
  
  Solutions:
  
  Check Data Dictionary: Verify that the structure or data element exists in the Data Dictionary (transaction SE11). Ensure that it is correctly defined and activated.
  Re-activate Objects: If the structure exists but is not activated, try reactivating it. Sometimes, reactivating can resolve inconsistencies.
  Check Transport Requests: If the issue arose after a transport, check the transport logs to ensure that all necessary objects were transported correctly.
  Review ABAP Code: Look at the ABAP code where the error occurs. Ensure that the structure is being referenced correctly and that it is in scope.
  Authorization Check: Ensure that the user has the necessary authorizations to access the data structure.
  Debugging: If the error occurs during runtime, use the ABAP debugger to trace the execution and identify where the issue arises.
  
  Related Information:
  
  Transaction Codes: SE11 (Data Dictionary), SE80 (Object Navigator), SE37 (Function Module), SE38 (ABAP Editor).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Review SAP documentation for data structures and ABAP programming for best practices and troubleshooting tips.
  
  If the problem persists after trying the above solutions, consider reaching out to your SAP Basis or ABAP development team for further assistance.