How To Fix EK356 - Entry found in the correspondence container is not unique

EK356 - Overview

• Message type: E = Error

• Message class: EK - IS-U Accounts Receivable and Payable

• Message number: 356

• Message text: Entry found in the correspondence container is not unique

What causes this issue?

The following entries in the correspondence container are ambiguous:
Business partner: &V1&
Contract account: &V2&
Returns document: &V3&

System Response

A returns notification cannot be printed.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

EK356 - Details

• The SAP error message EK356, which states "Entry found in the correspondence container is not unique," typically occurs in the context of document processing, particularly when dealing with purchasing documents or invoices. This error indicates that there are multiple entries in the correspondence container that match the criteria being processed, leading to ambiguity.
  Causes:
  
  Duplicate Entries: There may be multiple entries in the correspondence container for the same document or criteria, which SAP cannot resolve.
  
  Configuration Issues: The configuration settings for the correspondence container may not be set up correctly, leading to multiple entries being created for the same document.
  Data Integrity Issues: There may be issues with the data integrity in the database, such as incorrect or duplicate records.
  Custom Development: If there are custom developments or enhancements in the system, they may inadvertently create duplicate entries.
  
  Solutions:
  
  Check for Duplicates: Review the entries in the correspondence container to identify any duplicates. You can do this