How To Fix DD_MT_SHARING_CHK015 - &1 unique index(es) found (uniqueness not ensured for sharing type W/T/S)

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_MT_SHARING_CHK - DDIC Multi Tenancy Sharing: Messages

• Message number: 015

• Message text: &1 unique index(es) found (uniqueness not ensured for sharing type W/T/S)

What causes this issue?

Unique constraint cannot be ensured because shared tables with type W, T
or S involve a UNION view.

System Response

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

How to fix this 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 DD_MT_SHARING_CHK015 - &1 unique index(es) found (uniqueness not ensured for sharing type W/T/S) ?

  The SAP error message DD_MT_SHARING_CHK015 indicates that there are unique indexes found in the database that are not ensured for sharing types W (Write), T (Table), or S (Shared). This typically occurs in the context of data model sharing in SAP, particularly when dealing with database tables and their indexes.
  Cause:
  The error arises when the system detects that there are unique indexes defined on a table, but the sharing type of the table does not ensure uniqueness. This can happen in scenarios where:
  
  Data Model Configuration: The data model is incorrectly configured, leading to a mismatch between the defined unique indexes and the sharing type.
  Table Design: The table design may not have been properly aligned with the intended use cases, leading to potential data integrity issues.
  Database Constraints: There may be constraints in the database that are not being respected due to the sharing type settings.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Table Configuration: Check the configuration of the table in question. Ensure that the sharing type is appropriate for the unique indexes defined. If the table is meant to be shared, consider changing the sharing type or adjusting the indexes accordingly.
  
  
  Adjust Indexes: If the unique indexes are not necessary for the intended use of the table, consider removing or modifying them to align with the sharing type.
  
  
  Consult Documentation: Refer to SAP documentation or guidelines regarding data model sharing and index management to ensure compliance with best practices.
  
  
  Testing: After making changes, test the configuration to ensure that the error is resolved and that the data integrity is maintained.
  
  
  Seek Expert Help: If you are unsure about the changes, consider consulting with an SAP Basis or ABAP expert who can provide guidance based on the specific context of your SAP environment.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context on handling unique indexes and sharing types.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to review table definitions and indexes.
  Data Integrity: Always ensure that any changes made do not compromise data integrity or application functionality.
  
  By following these steps, you should be able to address the DD_MT_SHARING_CHK015 error effectively.