How To Fix WS168 - Internal error calling communication structure for document &1

WS168 - Overview

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 168

• Message text: Internal error calling communication structure for document &1

What causes this issue?

bis auf ersten Satz identisch mit WS 169, WS 170
Communication structure MCWBRK for document &V1& could not be compiled
Without the communication struture, 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 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.

WS168 - Details

• Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WS168 Internal error calling communication structure for document &1
  
  
  Cause:
  This error typically occurs during ALE/IDoc processing when SAP tries to call or process the communication structure (usually a function module or a BAPI) related to a specific document type, but encounters an internal problem. The placeholder &1 is replaced by the document number or type involved.
  Common causes include:
  
  Incorrect or missing partner profile configuration for the document type.
  Missing or incorrect function module assignment in the distribution model or partner profile.
  Authorization issues preventing the system from executing the communication structure.
  Inconsistent or corrupted IDoc data or metadata.
  Custom enhancements or user exits that fail during processing.
  Transport or system inconsistencies where the communication structure is not properly imported or activated.
  
  
  
  Solution:
  To resolve the WS168 error, follow these steps:
  
  
  Check Partner Profile Configuration:
  
  Go to transaction WE20.
  Verify the partner profile for the partner and message type involved.
  Ensure the correct