How To Fix COM_PRODUCT_API012 - Internal API error: &1 can only be called once per transaction

SAP Error Message - Details

• Message type: E = Error

• Message class: COM_PRODUCT_API - Messages for Product Interfaces

• Message number: 012

• Message text: Internal API error: &1 can only be called once per transaction

What causes this issue?

A program called a function module more than once within a transaction.
This is not allowed.

System Response

The API call is not processed further.

How to fix this error?

Contact your system administrator as this is an internal error.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message COM_PRODUCT_API012 - Internal API error: &1 can only be called once per transaction ?

  The SAP error message COM_PRODUCT_API012 indicates that a specific API function can only be called once per transaction. This error typically arises in scenarios where a function or method is invoked multiple times within the same transaction context, which is not allowed by the API's design.
  Cause:
  
  Multiple Calls: The most common cause is that the API function is being called multiple times in a single transaction. This could happen due to loops or repeated calls in the code.
  Transaction Management: The transaction management in your code may not be correctly structured, leading to multiple invocations of the same API.
  Incorrect Logic: There may be a logical error in the program that leads to the function being called more than once unintentionally.
  
  Solution:
  
  Review Code Logic: Check the code where the API is being called. Ensure that the function is only invoked once per transaction. You may need to refactor your code to prevent multiple calls.
  Use Flags: Implement a flag or a state variable to track whether the API has already been called in the current transaction. This can help prevent subsequent calls.
  Transaction Handling: Ensure that your transaction handling is correct. If you need to call the API multiple times, consider committing the transaction after the first call and starting a new transaction for subsequent calls.
  Debugging: Use debugging tools to trace the execution flow and identify where the multiple calls are occurring. This can help pinpoint the exact location in the code that needs to be modified.
  
  Related Information:
  
  API Documentation: Refer to the official SAP API documentation for details on the specific API you are using. This documentation often includes usage guidelines and limitations.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this error or provide additional context.
  Community Forums: Engage with the SAP community forums or user groups. Other users may have encountered the same issue and can provide insights or solutions.
  
  By following these steps, you should be able to resolve the COM_PRODUCT_API012 error and ensure that your API calls are structured correctly within your SAP application.