How To Fix WS661 - Not possible to determine partner without partner schema on header level

WS661 - Overview

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 661

• Message text: Not possible to determine partner without partner schema on header level

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 WS661 - Not possible to determine partner without partner schema on header level ?

  Certainly! Here's a detailed explanation of the SAP error message WS661: "Not possible to determine partner without partner schema on header level" including its cause, solution, and related information.
  
  SAP Error Message WS661
  Message Text:
  Not possible to determine partner without partner schema on header level
  
  Cause
  This error occurs during the processing of IDocs (Intermediate Documents) in SAP, specifically when the system tries to determine the partner number (logical system or business partner) for an IDoc but cannot find the necessary partner schema at the header level of the IDoc.
  
  The partner schema defines how the system identifies and processes partners in IDoc communication.
  If the partner schema is missing or not maintained for the IDoc type or message type at the header level, SAP cannot determine which partner the IDoc belongs to.
  This typically happens in scenarios involving inbound or outbound IDocs where partner profiles or partner determination settings are incomplete or incorrect.
  
  
  When does it occur?
  
  During