How To Fix VO729 - Unexpected return code APPL_LOG_WRITE_SINGLE_MESSAGE: &

SAP Error Message - Details

• Message type: E = Error

• Message class: VO - W&S: Rough workload forecast + picking wave

• Message number: 729

• Message text: Unexpected return code APPL_LOG_WRITE_SINGLE_MESSAGE: &

Self-Explanatory Message

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• What is the cause and solution for SAP error message VO729 - Unexpected return code APPL_LOG_WRITE_SINGLE_MESSAGE: & ?

  Certainly! Here's a detailed explanation regarding the SAP error message:
  
  SAP Error Message:
  VO729 Unexpected return code APPL_LOG_WRITE_SINGLE_MESSAGE: &
  
  1. Cause
  The error message VO729 with the text "Unexpected return code APPL_LOG_WRITE_SINGLE_MESSAGE: &" typically occurs when the system tries to write a log message using the Application Log (transaction SLG1/SLG0) but encounters an unexpected return code from the function module APPL_LOG_WRITE_SINGLE_MESSAGE.
  Possible causes include:
  
  Incorrect or incomplete parameters passed to the logging function module.
  Authorization issues preventing the log from being written.
  Inconsistent or missing entries in the Application Log object or subobject.
  System inconsistencies or database issues related to the Application Log tables.
  Custom code or enhancement that calls the logging function incorrectly.
  Transport or system upgrade issues causing mismatch in logging objects or function modules.
  
  
  2. Explanation
  
  The function module APPL_LOG_WRITE_SINGLE_MESSAGE is used to write a single message to the Application Log.
  It returns a code indicating success or failure.
  The error message VO729 is triggered when the return code is not as expected (usually not zero or success).
  The placeholder & in the message is replaced by the actual return code or error text returned by the function module.
  
  
  3. Solution
  To resolve this error, follow these steps:
  a) Check the Return Code
  
  Look at the actual return code or message that replaces the & in the error message.
  This will give clues about the specific problem (e.g., authorization error, missing log object).
  
  b) Verify Application Log Object and Subobject
  
  Use transaction SLG0 to check if the Application Log object and subobject used in the logging call exist and are active.
  If missing, create or activate them accordingly.
  
  c) Check Authorizations
  
  Ensure the user or process writing the log has the necessary authorizations for Application Log (authorization object S_LOG).
  Use transaction SU53 after the error occurs to check for missing authorizations.
  
  d) Review Custom Code or Enhancements
  
  If the error occurs in custom code, review the parameters passed to APPL_LOG_WRITE_SINGLE_MESSAGE.
  Ensure all mandatory parameters are correctly filled.
  Check for any recent changes or transports that might have affected the logging logic.
  
  e) Check System Logs and Dumps
  
  Look for related short dumps (transaction ST22) or system logs (transaction SM21) for more detailed error information.
  
  f) Database Consistency
  
  Run consistency checks on Application Log tables (e.g., BALHDR, BALDAT) if database inconsistencies are suspected.
  Consult Basis team if needed.
  
  g) SAP Notes and Support
  
  Search SAP Support Portal for notes related to VO729 or APPL_LOG_WRITE_SINGLE_MESSAGE.
  Apply any relevant SAP Notes or patches.
  
  
  4. Related Information
  
  Transaction SLG0: Maintain Application Log objects and subobjects.
  Transaction SLG1: Display Application Logs.
  Function Module APPL_LOG_WRITE_SINGLE_MESSAGE: Used to write messages to the Application Log.
  Authorization Object S_LOG: Controls access to Application Log.
  SAP Note examples (check SAP ONE Support Launchpad):
  
  Notes related to Application Log errors.
  Notes about APPL_LOG_WRITE_SINGLE_MESSAGE return codes.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  VO729 Unexpected return code APPL_LOG_WRITE_SINGLE_MESSAGE: &
  
  
  Cause
  Unexpected return code from Application Log write function due to parameter, auth, or config issues
  
  
  Solution
  Check return code, verify log object/subobject, check authorizations, review custom code, check system logs, apply SAP Notes
  
  
  Tools
  SLG0, SLG1, SU53, ST22, SM21
  
  
  
  
  If you provide the actual return code or additional context (e.g., when the error occurs, custom code involved), I can help you further narrow down the cause and solution.