How To Fix WS169 - Internal error compiling communication structure for item &1 of doc. &2

WS169 - Overview

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 169

• Message text: Internal error compiling communication structure for item &1 of doc. &2

What causes this issue?

bis auf ersten Satz identisch mit WS 168, WS 170
Communication structure MCWBRP for item &V1& of document &V2& could not
be compiled.
Without the communication structure, it is not possible to update data
in the Logistics Information System.

System Response

No update is carried out for any of the documents currently being
processed. Data is not updated in the Logistics Information System for
either Settlement Management itself or subsequent settlement (business
volume data or income (in the case of a settlement document)).

How to fix this error?

Contact your system administrator, as this situation should not occur.
It is probably due to a program error.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

WS169 - Details

• The SAP error message:
  WS169 Internal error compiling communication structure for item &1 of doc. &2
  typically occurs during IDoc processing or ALE/EDI communication when SAP tries to compile or generate the communication structure for a particular IDoc segment or item but encounters an internal error.
  
  Cause
  
  Inconsistent or incorrect IDoc segment definitions: The metadata or structure definition of the IDoc segment (item &1) in the IDoc type (doc. &2) might be corrupted or inconsistent.
  Missing or incorrect segment fields: The segment might have fields that are incorrectly defined or missing in the data dictionary.
  Transport or system inconsistencies: Sometimes, after transports or system upgrades, the IDoc metadata might not be properly updated or compiled.
  Custom segments or extensions: If the IDoc has custom segments or extensions, they might not be properly defined or activated.
  Buffer or generation issues: The internal buffer or generated communication structure might be out of sync or corrupted.
  
  
  Solution
  
  
  Check the IDoc segment &1 in