How To Fix DMC_GENERAL370 - Structure &1 is a lookup table; it cannot be mapped to a target structure

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_GENERAL - MWB: General Messages

• Message number: 370

• Message text: Structure &1 is a lookup table; it cannot be mapped to a target structure

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_GENERAL370 - Structure &1 is a lookup table; it cannot be mapped to a target structure ?

  The SAP error message DMC_GENERAL370 indicates that there is an issue with mapping a lookup table to a target structure in the context of Data Migration Cockpit (DMC) or similar data migration tools. This error typically arises when you attempt to map a structure that is defined as a lookup table, which is not allowed in the current context.
  Cause:
  
  Lookup Table Definition: The structure you are trying to map is defined as a lookup table in the system. Lookup tables are typically used for reference data and are not intended to be directly mapped to target structures.
  Incorrect Mapping: The mapping configuration may be incorrectly set up, where a lookup table is being treated as a standard data structure.
  Data Migration Configuration: The data migration configuration may not be set up to handle lookup tables appropriately.
  
  Solution:
  
  Review the Mapping: Check the mapping configuration in the Data Migration Cockpit. Ensure that you are not trying to map a lookup table directly to a target structure.
  Use Reference Data: If you need to use data from the lookup table, consider using it as reference data. You may need to extract the relevant data from the lookup table and map it to the target structure in a different way.
  Adjust Data Model: If necessary, adjust your data model to ensure that lookup tables are handled correctly. This may involve creating a separate mapping for the lookup data or transforming the data before mapping.
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit or the specific tool you are using to understand how to handle lookup tables correctly.
  Seek Support: If you are unable to resolve the issue, consider reaching out to SAP support or consulting with a technical expert who has experience with data migration in SAP.
  
  Related Information:
  
  Data Migration Cockpit (DMC): A tool used for migrating data into SAP systems, which includes functionalities for mapping, transforming, and validating data.
  Lookup Tables: These are tables that contain reference data, often used to provide a set of valid values for a field in another table.
  Mapping Configuration: The process of defining how source data maps to target structures in the context of data migration.
  
  By following these steps, you should be able to resolve the DMC_GENERAL370 error and successfully complete your data migration task.