How To Fix TT157 - BDC processing mode must be A, N or E

SAP Error Message - Details

• Message type: E = Error

• Message class: TT - Extended Computer Aided Test Tool (eCATT) messages

• Message number: 157

• Message text: BDC processing mode must be A, N or E

What causes this issue?

A, N, or E are the only entries possible for processing modes.
'A' stands for online processing, 'N' for background processing and
'E' for background processing unless errors occur.

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

System Response

How to fix this error?

Enter A, N or E.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TT157 - BDC processing mode must be A, N or E ?

  The SAP error message TT157, which states "BDC processing mode must be A, N or E," typically occurs during Batch Data Communication (BDC) processing when the specified processing mode is not valid. The processing modes in BDC are:
  
  A: Display mode
  N: Background mode
  E: Update mode
  
  Cause:
  The error is triggered when the BDC program is trying to execute with an invalid processing mode that is not one of the accepted values (A, N, or E). This can happen due to:
  
  Incorrect Configuration: The BDC program might be configured incorrectly, specifying a processing mode that is not recognized.
  Coding Error: There may be a mistake in the ABAP code where the processing mode is set.
  User Input: If the processing mode is being taken from user input, the user might have entered an invalid value.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check the Code: Review the ABAP code where the BDC processing mode is defined. Ensure that it is set to one of the valid values (A, N, or E). For example:
  CALL TRANSACTION 'transaction_code' USING bdcdata MODE 'E'.
  Make sure that the MODE parameter is correctly set.
  
  
  Validate User Input: If the processing mode is being taken from user input, implement validation to ensure that only valid options (A, N, E) can be selected.
  
  
  Debugging: If the issue persists, use the debugger to trace the execution of the BDC program and check the value being passed for the processing mode.
  
  
  Review BDC Session: If you are using a BDC session, ensure that the session is created correctly and that the processing mode is specified properly in the session parameters.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for additional context on BDC processing modes and their usage.
  
  
  Related Information:
  
  BDC (Batch Data Communication): A method used in SAP to transfer data into the system in batch mode, often used for data migration or mass data updates.
  Transaction Codes: Ensure that the transaction code being used in the BDC is valid and accessible.
  Error Handling: Implement error handling in your BDC program to catch and log errors for easier troubleshooting in the future.
  
  By following these steps, you should be able to identify and correct the cause of the TT157 error in your SAP BDC processing.