How To Fix DMC_GENERAL391 - &1 is a lookup table; path for structure &2 must be #User Defined Path#

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_GENERAL - MWB: General Messages

• Message number: 391

• Message text: &1 is a lookup table; path for structure &2 must be #User Defined Path#

What causes this issue?

If you assign a lookup table to a target structure, the Data Type Path
for the target structure must be User-Defined Path.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Additional Information About 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.

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_GENERAL391 - &1 is a lookup table; path for structure &2 must be #User Defined Path# ?

  The SAP error message DMC_GENERAL391 typically indicates an issue related to the Data Migration Cockpit (DMC) when working with lookup tables and user-defined paths in the context of data migration projects. This error suggests that the system is expecting a user-defined path for a specific structure but is encountering a lookup table instead.
  Cause:
  
  Lookup Table Misconfiguration: The error arises when the system expects a user-defined path for a structure but finds a lookup table instead. This can happen if the configuration of the data migration project is not set up correctly.
  Incorrect Mapping: The mapping of the data structure may not be aligned with the expected input, leading to the system not recognizing the path correctly.
  Data Model Issues: There may be issues with the data model where the lookup table is not properly defined or linked to the expected structure.
  
  Solution:
  
  Check Configuration: Review the configuration of the data migration project to ensure that the lookup tables are correctly defined and that the paths for the structures are set to user-defined paths as required.
  Adjust Mapping: Ensure that the mapping of the data structure is correct. If a lookup table is being used, verify that it is appropriately linked to the user-defined path.
  Define User-Defined Path: If the structure requires a user-defined path, make sure to define it correctly in the DMC settings. This may involve creating or modifying the path to ensure it aligns with the expected input.
  Consult Documentation: Refer to SAP documentation or guides related to the Data Migration Cockpit for specific instructions on how to handle lookup tables and user-defined paths.
  Testing: After making changes, test the migration process again to ensure that the error is resolved.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling lookup tables and user-defined paths.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Training and Documentation: Consider reviewing training materials or documentation related to the Data Migration Cockpit to better understand how to configure and manage data migration projects effectively.
  
  If the issue persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.