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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message WS169 - Internal error compiling communication structure for item &1 of doc. &2 ?

  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 IDoc type &2:
  
  Use transaction WE30 (IDoc Type Development) to display the IDoc type &2.
  Check the segment &1 for correctness.
  Verify that all fields are correctly defined and active.
  
  
  
  Recompile the IDoc type:
  
  In WE30, regenerate the IDoc type &2.
  This recompilation can fix inconsistencies in the communication structure.
  
  
  
  Check for missing or inconsistent segments:
  
  Use WE31 to check the segment &1.
  Ensure the segment is active and consistent.
  
  
  
  Check for transport or system inconsistencies:
  
  If the error started after a transport or upgrade, re-import or re-apply the transport.
  Run report RSNAST00 or RSNASTED to check for IDoc errors.
  
  
  
  Check for custom segments or extensions:
  
  If the IDoc has custom segments, verify their definitions and activation.
  Use WE82 to check message type assignments.
  
  
  
  Clear buffer and regenerate:
  
  Sometimes, clearing the buffer helps.
  Use transaction BD87 to reprocess IDocs.
  Use report RSNAST00 to analyze and reprocess.
  
  
  
  Check SAP Notes:
  
  Search SAP Support Portal for notes related to WS169.
  There might be specific patches or corrections.
  
  
  
  
  Related Information
  
  
  Transactions:
  
  WE30 - IDoc Type Development
  WE31 - IDoc Segment Editor
  WE82 - Assign Message Type to IDoc Type
  BD87 - Reprocessing IDocs
  WE02 / WE05 - IDoc Display and Monitoring
  
  
  
  SAP Notes:
  
  Check SAP Notes for WS169 or related IDoc errors.
  Example: SAP Note 0000000 (replace with actual note number if found)
  
  
  
  Documentation:
  
  SAP Help Portal on IDoc development and troubleshooting.
  ALE/EDI configuration guides.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Inconsistent or corrupted IDoc segment definition or communication structure compilation
  
  
  Solution
  Check and recompile IDoc type and segments; verify custom segments; clear buffers; reprocess IDocs
  
  
  Tools
  WE30, WE31, WE82, BD87, WE02, WE05
  
  
  Additional
  Check SAP Notes and apply relevant patches
  
  
  
  
  If the problem persists after these steps, consider raising a message with SAP Support including the exact IDoc type, segment, and system details.