How To Fix 0C055 - The first key field of table & is not MANDT

SAP Error Message - Details

• Message type: E = Error

• Message class: 0C - Customizing Batch Management

• Message number: 055

• Message text: The first key field of table & is not MANDT

What causes this issue?

Table &V1& cannot be defined as a message destination for one of
the following reasons:
The MANDT field is not the first key field of the table.
The domain assigned to the MANDT field does not belong to the same data
type as the MANDT domain.
The domain assigned to the MANDT field does not define the same field
length as the MANDT domain.
The destination is not created.

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?

Check the definition of table &V1& in the ABAP/4 Dictionary and
correct it according to the requirements listed above.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 0C055 - The first key field of table & is not MANDT ?

  The SAP error message 0C055 indicates that the first key field of a specified table is not the client field (MANDT). In SAP, the client field is crucial for multi-client architecture, as it differentiates data between different clients in the same system.
  Cause:
  
  Table Definition: The table in question is defined without MANDT as the first key field. This is against the standard practice in SAP, where the first key field of any table should be the client field.
  Custom Development: If the table is a custom table created by a developer, it may have been incorrectly defined without adhering to SAP's conventions.
  Transport Issues: If the table definition was transported from another system, it might not have been set up correctly in the target system.
  
  Solution:
  
  Check Table Definition: Review the table definition in the Data Dictionary (transaction SE11). Ensure that MANDT is the first key field.
  Modify Table Structure: If MANDT is not the first key field, you may need to modify the table structure. This can be done by:
  
  Creating a new table with the correct structure and migrating the data.
  Using transaction SE14 (Database Utility) to adjust the table structure, if applicable.
  
  
  Consult Documentation: If the table is part of a standard SAP application, consult SAP documentation or support to understand the implications of changing the table structure.
  Testing: After making changes, thoroughly test the application to ensure that it functions correctly with the modified table structure.
  
  Related Information:
  
  Client Field (MANDT): This is a key field in SAP that indicates the client in which the data is stored. It is essential for data segregation in multi-client environments.
  Data Dictionary (SE11): This transaction allows you to view and modify the definitions of database tables, views, data elements, domains, etc.
  Transport Management: If the issue arose from a transport, ensure that the transport request is correctly configured and that all necessary objects are included.
  
  Best Practices:
  
  Always follow SAP's guidelines for table design, especially regarding the use of the client field.
  When creating custom tables, ensure that they are compliant with SAP's multi-client architecture.
  Regularly review and audit custom developments to ensure they align with SAP standards.
  
  If you are unsure about making changes to the table structure, it is advisable to consult with an experienced SAP Basis or ABAP consultant.