How To Fix MG101 - Session &: first transaction does not begin with header record

MG101 - Overview

• Message type: E = Error

• Message class: MG - Batch input: material master

• Message number: 101

• Message text: Session &: first transaction does not begin with header record

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MG101 - Session &: first transaction does not begin with header record ?

  The SAP error message MG101 indicates that there is an issue with the data being processed in a session, specifically that the first transaction in the session does not begin with a header record. This error typically occurs during the processing of IDocs or when importing data into SAP using batch input sessions.
  
  Cause:
  
  Missing Header Record: The first record in the session is expected to be a header record, but it is either missing or incorrectly formatted.
  Incorrect File Format: The file being processed may not be in the expected format, leading to the system not recognizing the first record as a header.
  Data Corruption: The data file may be corrupted or improperly structured, causing the system to misinterpret the records.
  Session Configuration: The session may not be configured correctly to handle the incoming data.
  
  
  Solution:
  
  Check the Input File: Ensure that the input file being processed has the correct structure. The first line should be