How To Fix WU866 - Changing the selling period: Subsequent processing has already begun

WU866 - Overview

• Message type: E = Error

• Message class: WU - Promotion management messages

• Message number: 866

• Message text: Changing the selling period: Subsequent processing has already begun

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 WU866 - Changing the selling period: Subsequent processing has already begun ?

  The SAP error message WU866, which states "Changing the selling period: Subsequent processing has already begun," typically occurs when you attempt to change the selling period of a sales document (like a sales order or a contract) after certain subsequent processes have already been initiated. This can include processes such as delivery creation, billing, or any other follow-up activities that depend on the original sales document.
  
  Cause:
  
  Subsequent Processing Initiated: The primary cause of this error is that the sales document has already been processed in a way that makes it impossible to change the selling period. For example, if a delivery has been created or an invoice has been generated based on the sales order, the system locks certain fields to maintain data integrity.
  Document Status: The status of the document may not allow changes to the selling period. If the document is in a status that indicates it has been processed,