How To Fix WS170 - 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: 170

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

What causes this issue?

almost the same as WS 168, WS 169
Communication structure MCWBRL for item &V1& of document &V2&
(settlement document list or similar) 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.

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WS170 - Internal error compiling communication structure for item &1 of doc. &2 ?

  The SAP error message:
  WS170 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 inconsistency or error.
  
  Cause
  
  Inconsistent or incorrect IDoc segment definitions: The communication structure for the IDoc segment (item &1) in the document (doc. &2) cannot be compiled due to inconsistencies in the segment definition or metadata.
  Corrupted or outdated IDoc metadata: The metadata or dictionary objects related to the IDoc segment might be corrupted or not properly generated.
  Transport or system inconsistencies: If IDoc segment definitions or related objects were transported incorrectly or incompletely between systems, this error can occur.
  Custom segments or extensions: If custom segments or extensions have been added but not properly activated or generated, the system may fail to compile the communication structure.
  Missing or incorrect data in the IDoc: Sometimes the data in the IDoc itself may cause the structure compilation to fail if it violates expected formats or constraints.
  
  
  Solution
  
  
  Check the IDoc segment &1:
  
  Use transaction WE30 (IDoc Type Development) to check the segment definition.
  Verify that the segment is active and correctly defined.
  If it is a custom segment, ensure it has been properly created and activated.
  
  
  
  Regenerate the IDoc metadata:
  
  Use transaction WE31 to check the segment structure.
  Use WE60 to generate documentation and verify the structure.
  If necessary, regenerate the IDoc type or segments.
  
  
  
  Check for transport issues:
  
  Verify that all relevant objects related to the IDoc type and segments have been correctly transported.
  Reimport transports if necessary.
  
  
  
  Check the IDoc data:
  
  Use transaction WE02 or WE05 to display the IDoc &2.
  Look for any anomalies or data inconsistencies in the segment &1.
  Correct or reprocess the IDoc if data issues are found.
  
  
  
  Apply SAP Notes:
  
  Search the SAP Support Portal for notes related to WS170 or IDoc communication structure compilation errors.
  Apply any relevant SAP Notes or patches.
  
  
  
  Debugging:
  
  If the problem persists, debugging the IDoc processing function modules (e.g., those related to segment processing) may help identify the root cause.
  Check the program or function module that processes the IDoc for errors.
  
  
  
  
  Related Information
  
  
  Transactions:
  
  WE30 - IDoc Type Development
  WE31 - IDoc Segment Editor
  WE60 - IDoc Documentation
  WE02 / WE05 - IDoc Display
  BD87 - Reprocess IDocs
  
  
  
  SAP Notes:
  
  Search for notes with keywords like "WS170", "communication structure", "IDoc segment compilation".
  Example SAP Note (hypothetical): 1234567 - "Error WS170 during IDoc processing due to segment definition issues"
  
  
  
  IDoc Basics:
  
  Understanding IDoc structure: Control record, Data segments, Status records.
  Communication structures are ABAP structures generated from IDoc segments for processing.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WS170 Internal error compiling communication structure for item &1 of doc. &2
  
  
  Cause
  Inconsistent or corrupted IDoc segment definition or metadata; transport issues; data errors
  
  
  Solution
  Check and regenerate segment definitions; verify IDoc data; apply SAP Notes; reimport transports
  
  
  Tools
  WE30, WE31, WE60, WE02, WE05, BD87
  
  
  Additional
  Debug IDoc processing if needed; consult SAP Support for patches or notes
  
  
  
  
  If you provide the exact segment name (&1) and document number (&2), more specific guidance can be given.