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

AQ013 - Overview

• 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

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.

Unfortunately, there isn't any extra information in this error notice.

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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