How To Fix BCS_MAIL400 - Invalid main part

SAP Error Message - Details

• Message type: E = Error

• Message class: BCS_MAIL - BCS: Mail messages

• Message number: 400

• Message text: Invalid main part

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 BCS_MAIL400 - Invalid main part ?

  The SAP error message BCS_MAIL400 Invalid main part typically occurs in the context of the Business Communication Services (BCS) when there is an issue with the email content being processed. This error indicates that the main part of the email (usually the body or the main content) is not formatted correctly or is missing.
  Causes:
  
  Missing Content: The email body may be empty or not properly defined.
  Incorrect Formatting: The content may not adhere to the expected MIME type or format.
  Attachment Issues: If there are attachments, they may not be correctly linked to the email body.
  Configuration Issues: There may be issues with the BCS configuration or settings in the SAP system.
  Data Type Mismatch: The data being sent may not match the expected types or formats.
  
  Solutions:
  
  Check Email Content: Ensure that the email body is populated with valid content. If it is dynamically generated, verify that the data source is providing the expected output.
  Review MIME Types: Make sure that the content type is correctly set. For example, if you are sending HTML content, ensure that the MIME type is set to text/html.
  Validate Attachments: If there are attachments, ensure they are correctly formatted and linked to the email.
  Configuration Review: Check the BCS configuration settings in the SAP system to ensure they are set up correctly for sending emails.
  Debugging: If you have access to debugging tools, you can trace the email sending process to identify where the error occurs.
  SAP Notes: Check for any relevant SAP Notes or updates that may address this specific error. Sometimes, there are patches or updates that resolve known issues.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for BCS for detailed information on email configuration and troubleshooting.
  Community Forums: SAP Community and other forums can be helpful for finding similar issues faced by other users and their solutions.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SOST (to check the status of sent emails) and SCOT (for communication settings).
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.