How To Fix /SCWM/IL027 - External document number &1 is already used in warehouse number &2

/SCWM/IL027 - Overview

• Message type: E = Error

• Message class: /SCWM/IL -

• Message number: 027

• Message text: External document number &1 is already used in warehouse number &2

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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/SCWM/IL027 - Details

• The SAP error message /SCWM/IL027 indicates that the external document number you are trying to use is already in use within the specified warehouse number. This error typically occurs in the context of warehouse management processes, such as inbound or outbound deliveries, where unique identifiers are required for tracking and processing.
  
  Cause:
  
  Duplicate External Document Number: The external document number you are trying to use has already been assigned to another document in the specified warehouse.
  Incorrect Data Entry: There may have been a mistake in entering the external document number, leading to a conflict with an existing entry.
  System Configuration: The system may be configured to enforce unique external document numbers for certain processes, and the current number does not meet this requirement.
  
  
  Solution:
  
  Check Existing Documents: Verify if the external document number is indeed in use. You can do this by searching for the document in the relevant transaction or report in SAP.
  Use a