How To Fix DMC_EXCEPTION004 - Only source structures can be defined as lookup tables

DMC_EXCEPTION004 - Overview

• Message type: E = Error

• Message class: DMC_EXCEPTION - Message class for exception texts

• Message number: 004

• Message text: Only source structures can be defined as lookup tables

A lookup table contains records that are looked up from a field in
another table to fill in the value of that field. The table can be
referenced by rules and used by mapping operations, but does not
directly provide content for fields in the target system.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_EXCEPTION004 - Only source structures can be defined as lookup tables ?

  The SAP error message DMC_EXCEPTION004: Only source structures can be defined as lookup tables typically occurs in the context of SAP Data Management and Data Integration processes, particularly when working with Data Migration Cockpit (DMC) or similar tools.
  
  Cause:
  This error indicates that you are trying to define a lookup table using a structure that is not a source structure. In SAP, lookup tables are used to map values from one set of data to another, and they must be based on source structures that are defined in the data model. If you attempt to use a target structure or any other non-source structure as a lookup table, this error will be triggered.
  
  Solution:
  To resolve this error, you should ensure that:
  
  
  Use Source Structures: Verify that the structure you are trying to define as a lookup table is indeed a source structure. You can check the data model or the configuration settings to confirm