How To Fix /PM0/APIF_MESSAGES021 - Call is only possible with single processing

SAP Error Message - Details

• Message type: E = Error

• Message class: /PM0/APIF_MESSAGES -

• Message number: 021

• Message text: Call is only possible with single processing

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PM0/APIF_MESSAGES021 - Call is only possible with single processing ?

  The SAP error message /PM0/APIF_MESSAGES021 Call is only possible with single processing typically occurs in the context of the SAP Plant Maintenance (PM) module when a function or API is called that requires single processing mode, but the system is currently set to handle multiple processing requests.
  Cause:
  
  Batch Processing: The error usually arises when a function that is designed to handle a single record is called in a batch processing context. This can happen if you are trying to process multiple maintenance orders or notifications at once when the function only supports single entries.
  Incorrect Function Call: The function or API being called may not be designed to handle multiple entries, leading to this error when it is invoked in a context that attempts to process multiple records.
  Configuration Issues: There may be configuration settings in the system that are not aligned with the expected processing mode for the API or function being called.
  
  Solution:
  
  Single Processing Mode: Ensure that the function or API is called in single processing mode. This may involve modifying the code or the way the function is invoked to ensure that only one record is processed at a time.
  Check Function Documentation: Review the documentation for the specific API or function you are using to confirm that it supports only single processing and to understand the correct usage.
  Debugging: If you have access to the development environment, you can debug the program to identify where the function is being called and ensure that it is being called correctly.
  Error Handling: Implement error handling in your code to catch this specific error and provide a user-friendly message or alternative processing path.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches or updates that could resolve the issue.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the PM module and the specific API you are using for more detailed information on its usage and limitations.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP PM that may help in troubleshooting or processing maintenance orders and notifications.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to your SAP support team or a consultant with expertise in SAP PM for further assistance.