How To Fix ICC_CN866 - External document number changed in accounting document

ICC_CN866 - Overview

• Message type: E = Error

• Message class: ICC_CN - Nachrichten zum Druck vornumerierter SD-Belege

• Message number: 866

• Message text: External document number changed in accounting document

Self-Explanatory Message

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ICC_CN866 - Details

• The SAP error message ICC_CN866, which states "External document number changed in accounting document," typically occurs in the context of financial accounting and document management within SAP. This error indicates that there is a discrepancy between the external document number that was originally entered and the one that is currently being processed in the accounting document.
  
  Cause:
  
  Manual Changes: The external document number may have been manually changed after the document was created, leading to a mismatch.
  Data Migration Issues: If data was migrated from another system, inconsistencies in document numbers can arise.
  Integration Issues: If there are integrations with other systems (like third-party applications), the external document number may not be synchronized correctly.
  Configuration Settings: Incorrect configuration in the document management settings or accounting settings can lead to this error.
  
  
  Solution:
  
  Check Document Number: Verify the external document number in the accounting document and ensure it matches the original entry.
  Re-enter Document: If the document number has