How To Fix /SAPAPO/OM427 - ATP switched on in parallel

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM -

• Message number: 427

• Message text: ATP switched on in parallel

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/OM427 - ATP switched on in parallel ?

  The SAP error message /SAPAPO/OM427 ATP switched on in parallel typically occurs in the context of Advanced Planning and Optimization (APO) when there are issues related to the Availability Check (ATP) process. This error indicates that the system is trying to perform an Availability Check in parallel for the same product or order, which is not allowed.
  Cause:
  
  Parallel Processing: The error is primarily caused by multiple processes trying to perform an ATP check simultaneously for the same material or order. This can happen in scenarios where multiple users or processes are attempting to check availability at the same time.
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. When one process is performing an ATP check, it locks the relevant data, and any other process trying to access the same data will encounter this error.
  Configuration Issues: There may be configuration settings in the APO system that are not optimized for parallel processing.
  
  Solution:
  
  Check for Parallel Processes: Identify if there are multiple transactions or processes that are trying to perform ATP checks on the same material or order. If possible, coordinate these processes to avoid simultaneous checks.
  Increase Lock Timeout: If the issue is due to long-running processes, consider increasing the lock timeout settings in the system to allow more time for the ATP check to complete before another process attempts to access the same data.
  Review Custom Code: If there is any custom code or enhancements that perform ATP checks, review them to ensure they are not inadvertently causing parallel checks.
  Batch Processing: If applicable, consider using batch processing for ATP checks to minimize the chances of parallel execution.
  System Performance: Ensure that the system performance is optimal. Sometimes, slow performance can lead to processes taking longer than expected, causing overlaps.
  SAP Notes: Check for any relevant SAP Notes that may address this issue. SAP frequently releases updates and patches that can resolve known issues.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like /SAPAPO/OM17 to monitor and analyze ATP checks.
  Debugging: If you have access to debugging tools, you can trace the ATP check process to identify where the parallel execution is occurring.
  SAP Community: Engaging with the SAP Community or forums can provide insights from other users who may have encountered and resolved similar issues.
  Documentation: Review the official SAP documentation for APO and ATP processes for best practices and configuration guidelines.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or APO support team for further investigation.