How To Fix CNV_IUUC_DB_CONN084 - Cannot create logging table &1; table exists with different structure

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_IUUC_DB_CONN - db connection

• Message number: 084

• Message text: Cannot create logging table &1; table exists with different structure

What causes this issue?

SAP LT Replication Server tries to create a logging table in the source
system, but a table with the same name already exists in the source
system. The structure of the existing table is different to the
structure of the table that the SAP LT Replication Server is trying to
create.
You can display the structures of the tables and check the difference as
follows:
+,,In LTRC -> Expert Function -> Display Table Information, you can
display the structure of the existing logging table.
+,,In LTRC -> Expert Function -> View Trigger Source Code, choose
Generated Code for the source table to display the triggers that should
be generated for the source table. The fields that are shown in the
generated triggers are the logging table fields that the SAP LT
Replication Server is trying to create.

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

System Response

The system does not create the logging table.

How to fix this error?

If you have connected a source system to two SAP LT Replication Server
systems, it is possible that both SAP LT Replication Server systems use
the same logging table name for two logging tables that are different.
We recommend only connecting a source system to only one SAP LT
Replication Server system. If you cannot avoid connecting a single
source system to multiple SAP LT Replication Server systems, follow the
solution provided in SAP Note 1892481. You must then identify the entry
in table IUUC_LOGTAB_ID in the SAP LT Replication Server system which
corresponds to the failed logging table (providing the mass transfer ID
and the name of the table), and delete this entry.
If you are only using one SAP LT Replication Server system, and the
source table is used by other configurations, all configurations will
share the same logging table. This means that the logging table
structure must be the same for all configurations. This is not the case,
for example, if some configurations have specific settings to improve
performance, but other configurations do not have these settings. Either
all configurations must use the same settings to improve performance, or
none of the configurations can use these settings.
This error can also occur when the source system is a copy of some other
system and still contains the obsolete SAP LT Replication Server data of
the original system. After a system copy, you have to clean up obsolete
SAP LT Replication Server data before you can use it as a source system
for SAP LT Replication Server.

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 CNV_IUUC_DB_CONN084 - Cannot create logging table &1; table exists with different structure ?

  The SAP error message CNV_IUUC_DB_CONN084 indicates that there is an issue with creating a logging table because a table with the same name already exists in the database, but its structure is different from what the system expects. This error typically occurs during data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or other data migration tools.
  Cause:
  
  Existing Table: The logging table that the system is trying to create already exists in the database.
  Different Structure: The existing table has a different structure (e.g., different columns, data types, or constraints) than what the migration process expects.
  Incomplete Cleanup: Previous migration attempts may not have cleaned up the logging tables properly, leading to conflicts.
  Version Mismatch: The version of the migration tool or the database schema may not match the expected structure.
  
  Solution:
  
  
  Check Existing Table: 
  
  Use database tools (like SQL queries) to check the structure of the existing table. You can use a query like DESCRIBE <table_name> or SHOW CREATE TABLE <table_name> to see its structure.
  
  
  
  Drop or Rename the Existing Table:
  
  If the existing table is not needed, you can drop it using a SQL command:
  DROP TABLE <table_name>;
  
  If you want to keep the existing data, consider renaming the table:
  RENAME TABLE <old_table_name> TO <new_table_name>;
  
  
  
  
  Adjust Migration Configuration:
  
  If the existing table is required, you may need to adjust the migration configuration to match the existing table's structure or modify the migration process to accommodate the existing table.
  
  
  
  Re-run the Migration:
  
  After resolving the table structure issue, re-run the migration process to create the logging table successfully.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to the specific migration tool you are using for any additional steps or considerations.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error. You can search for the error code or related keywords in the SAP Support Portal.
  Database Logs: Review database logs for any additional error messages or warnings that may provide more context about the issue.
  Migration Tool Documentation: Refer to the documentation for the specific migration tool (e.g., SLT, SAP Data Services) for best practices and troubleshooting steps.
  
  By following these steps, you should be able to resolve the CNV_IUUC_DB_CONN084 error and successfully create the logging table as needed.