How To Fix MCLI001 - Application tables (master/transaction data) must be client-specific

SAP Error Message - Details

• Message type: E = Error

• Message class: MCLI - Multiple Client Messages

• Message number: 001

• Message text: Application tables (master/transaction data) must be client-specific

What causes this issue?

All business data belongs exclusively to the customer. It must be
protected from access by other customers. This applies to read, write
and analysis access to customer data.
To be able to guarantee the multiclient compliance of a mySAP.com
solution, the application tables must be client-specific. This is an
essential prerequisite for guaranteeing the data isolation of clients.
Cross-client application data can be accessed and changed by all
clients. This compromises the multiclient compliance of the associated
sub-application, which cannot be used in certain markets (such as the
ASP market).

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?

Make sure that the table is really an application table, in other words,
that it contains business-relevant data such as master data or
transaction data. If this is so, check why the table is not defined as
client-specific. If client-independence is really necessary, explain why
customer data isolation is not necessary here, or how it can be
achieved.

Procedure for System Administrators

A multiclient check implemented by CheckMan checks whether the above
requirements have been met. The correctly defined cross-client objects
can also be entered in the <ZH>Multiclient Manager</> tool (transaction
<DS:TRAN.MCLIMAN>MCliMan</>) retroactively, from where you can display
them in full.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MCLI001 - Application tables (master/transaction data) must be client-specific ?

  The SAP error message MCLI001 indicates that the application tables for master or transaction data must be client-specific. This error typically arises when there is an attempt to create or modify a table that is not configured to be client-specific, which is a requirement for certain types of data in SAP.
  Cause:
  
  Table Configuration: The table in question is not set up to be client-specific. In SAP, client-specific tables are those that store data that is unique to a particular client (i.e., a separate instance of the SAP system). This is important for data integrity and separation between different business units or entities.
  Data Model Violation: The error may occur if there is an attempt to insert or update data in a table that is expected to be client-specific but is not defined as such in the data model.
  Development or Customization Issues: If you are developing custom tables or modifying existing ones, you may have inadvertently set the table to be cross-client instead of client-specific.
  
  Solution:
  
  Check Table Definition: Review the definition of the table in the Data Dictionary (SE11). Ensure that the table is marked as client-specific. This is done by checking the "Client-Dependent" checkbox in the table definition.
  Adjust Table Settings: If the table is not client-specific and it needs to be, you will need to adjust its settings. This may involve:
  
  Changing the table definition to make it client-specific.
  Ensuring that the relevant fields are set up correctly to support client-specific data.
  
  
  Data Migration: If you are migrating data into this table, ensure that the data being inserted is appropriate for the client context.
  Consult Documentation: Refer to SAP documentation or consult with your SAP Basis or ABAP team to ensure that the table design aligns with best practices for client-specific data handling.
  
  Related Information:
  
  Client Concept in SAP: Understanding the client concept in SAP is crucial. Each client in an SAP system can have its own set of data, and certain tables must be designed to accommodate this separation.
  Transaction Codes: Familiarize yourself with transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), and SE80 (Object Navigator) for managing and reviewing table definitions.
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to the MCLI001 error message.
  Testing: After making changes, test the functionality to ensure that the error is resolved and that the application behaves as expected.
  
  By following these steps, you should be able to resolve the MCLI001 error and ensure that your application tables are correctly configured for client-specific data.