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

0C055 - Overview

• 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.

0C055 - Details

• 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