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

TT157 - Overview

• 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.

TT157 - Details

• 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.