How To Fix SY344 - CALL TRANSACTION ... USING cannot be nested

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 344

• Message text: CALL TRANSACTION ... USING cannot be nested

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message SY344 - CALL TRANSACTION ... USING cannot be nested ?

  The SAP error message SY344 indicates that there is an attempt to nest a CALL TRANSACTION ... USING statement within another CALL TRANSACTION statement. In SAP ABAP, the CALL TRANSACTION statement is used to execute a transaction programmatically, and it cannot be nested due to the way SAP handles transaction processing.
  Cause:
  The error occurs when:
  
  You have a CALL TRANSACTION statement inside another CALL TRANSACTION statement.
  This can happen if you are trying to call a transaction from within an event or a method that is already executing a transaction.
  
  Solution:
  To resolve this error, you need to refactor your code to avoid nesting CALL TRANSACTION statements. Here are some approaches you can take:
  
  
  Separate Transactions: Instead of nesting, separate the logic into different parts. You can call the first transaction, and once it completes, you can call the second transaction in a different context (e.g., after the first transaction has finished).
  
  
  Use BAPIs or Function Modules: If possible, use BAPIs (Business Application Programming Interfaces) or function modules to perform the required actions instead of calling transactions. BAPIs are designed to be called from other programs and can often achieve the same results without the need for a transaction call.
  
  
  Use CALL FUNCTION: If the logic you are trying to execute can be encapsulated in a function module, consider using CALL FUNCTION instead of CALL TRANSACTION.
  
  
  Check for Event Handling: If the nested call is happening due to event handling (like in a screen or dialog), ensure that the logic is structured to avoid calling a transaction from within another transaction's context.
  
  
  Related Information:
  
  Documentation: Refer to the SAP ABAP documentation for more details on CALL TRANSACTION and its usage.
  Debugging: Use the ABAP debugger to trace the execution flow and identify where the nested call is occurring.
  Performance Considerations: Be mindful of performance implications when refactoring code, especially if you are replacing transaction calls with BAPIs or function modules.
  
  By following these guidelines, you should be able to resolve the SY344 error and improve the structure of your ABAP code.