How To Fix AQ013 - Function modules may only be used once

SAP Error Message - Details

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 013

• Message text: Function modules may only be used once

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message AQ013 - Function modules may only be used once ?

  The SAP error message AQ013 ("Function modules may only be used once") typically occurs when a function module is called multiple times in a context where it is designed to be executed only once. This is often seen in scenarios involving asynchronous processing or when using certain types of function modules that are not reentrant.
  Cause:
  
  Reentrancy Issue: The function module is not designed to be reentrant, meaning it cannot be called multiple times in the same context or transaction.
  Improper Use in Loops: If the function module is called within a loop or multiple times in a single transaction, it can trigger this error.
  Asynchronous Processing: If the function module is intended for asynchronous processing, calling it synchronously or multiple times can lead to this error.
  
  Solution:
  
  Check Function Module Documentation: Review the documentation for the function module to understand its intended use and limitations.
  Avoid Multiple Calls: Ensure that the function module is called only once in the relevant context. If you need to perform the operation multiple times, consider redesigning the logic to handle it differently.
  Use Temporary Variables: If the function module needs to be called multiple times with different parameters, consider storing the results in temporary variables or tables to avoid repeated calls.
  Debugging: Use the debugger to trace the execution flow and identify where the function module is being called multiple times inadvertently.
  Refactor Code: If necessary, refactor the code to separate the logic that requires the function module from the logic that needs to be executed multiple times.
  
  Related Information:
  
  Function Module Characteristics: Understand the characteristics of the function module you are using. Some function modules are designed for specific use cases and may have restrictions on how they can be invoked.
  SAP Notes: Check SAP Notes for any known issues or updates related to the function module in question. There may be patches or recommendations from SAP that address this error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered the same issue and what solutions they have found.
  
  By following these steps, you should be able to resolve the AQ013 error and ensure that your function module is used correctly within your SAP application.