How To Fix B1657 - Partner systems must not match in BD64 &1 &2 &3 &4

B1657 - Overview

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 657

• Message text: Partner systems must not match in BD64 &1 &2 &3 &4

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message B1657 - Partner systems must not match in BD64 &1 &2 &3 &4 ?

  The SAP error message B1657 indicates that there is a mismatch in the partner systems defined in the distribution model (BD64) for the logical systems involved in the message. This error typically arises when you are trying to set up or modify a distribution model in SAP's ALE (Application Link Enabling) environment, and it suggests that the partner systems you are trying to configure are identical or not set up correctly.
  
  Cause:
  The error occurs when:
  
  You have defined the same logical system as both the sender and receiver in the distribution model.
  There is an attempt to create a model view where the same system is listed as both a sender and a receiver, which is not allowed.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check the Distribution Model (BD64):
  
  Go to transaction code BD64.
  Review the distribution model you are working with.
  Ensure that the sender and receiver logical systems are different. If they are