How To Fix CNV_DMC_MC_EXCEPTION076 - &1 is a lookup table; it cannot be part of any foreign key relationship

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC_EXCEPTION - Exception texts of Migration Object Modeller

• Message number: 076

• Message text: &1 is a lookup table; it cannot be part of any foreign key relationship

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 CNV_DMC_MC_EXCEPTION076 - &1 is a lookup table; it cannot be part of any foreign key relationship ?

  The SAP error message CNV_DMC_MC_EXCEPTION076 indicates that a specific table, referred to as a "lookup table," cannot be part of any foreign key relationship. This error typically arises during data migration or conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools.
  Cause:
  
  Lookup Table Definition: Lookup tables are designed to store reference data that is not meant to be linked to other tables through foreign keys. They often contain static data that is used for validation or selection purposes.
  Foreign Key Constraints: The error occurs when there is an attempt to establish a foreign key relationship with a lookup table, which is not allowed by design. Foreign keys are meant to enforce referential integrity between tables, and lookup tables are not structured to support this.
  Data Model Misconfiguration: The data model may have been incorrectly configured, leading to an attempt to create a foreign key relationship with a lookup table.
  
  Solution:
  
  Review Data Model: Check the data model to ensure that lookup tables are not being incorrectly referenced in foreign key relationships. Ensure that the relationships are defined correctly according to the intended design.
  Remove Foreign Key Relationships: If a foreign key relationship is mistakenly defined with a lookup table, remove it. Ensure that the lookup table is only used for reference and not as a parent or child in a foreign key relationship.
  Adjust Migration Logic: If you are using a migration tool, review the migration logic to ensure that it does not attempt to create foreign key relationships with lookup tables.
  Consult Documentation: Refer to SAP documentation or guidelines regarding the use of lookup tables and foreign key relationships to ensure compliance with best practices.
  
  Related Information:
  
  SAP Data Migration Cockpit (DMC): This tool is used for data migration in SAP systems. Understanding its configuration and how it handles different types of tables can help prevent such errors.
  Table Types in SAP: Familiarize yourself with different table types in SAP (e.g., transparent tables, pooled tables, cluster tables, and lookup tables) to understand their intended use and constraints.
  SAP Notes and Community: Check SAP Notes for any specific patches or updates related to this error. The SAP Community forums can also be a valuable resource for troubleshooting and finding solutions shared by other users.
  
  By following these steps, you should be able to resolve the error CNV_DMC_MC_EXCEPTION076 and ensure that your data migration process runs smoothly.