How To Fix CNV_IUUC_DB_CONN121 - Parallel replication not possible for table &1; field &2 does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_IUUC_DB_CONN - db connection

• Message number: 121

• Message text: Parallel replication not possible for table &1; field &2 does not exist

Short Text
Parallel replication not possible for table &V1&; key field does not
exist
Diagnosis
In order to replicate a table in parallel, the system groups similar
rows together. The system uses key fields to group these rows together.
System Response
The system cannot parallelize table &V1& (from mass transfer ID &V3&)
because the system requires at least one key field to group the rows
together. You have specified the field &V2&. This field either does not
exist, or is not a key field.
Procedure
Ensure that a key field from table &V1& is specified in the control
table IUUC_REPL_PARALL.

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

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_CONN121 - Parallel replication not possible for table &1; field &2 does not exist ?

  The SAP error message CNV_IUUC_DB_CONN121 indicates that there is an issue with parallel replication for a specific table and field during a data migration or replication process. This error typically arises in the context of SAP Landscape Transformation (SLT) or SAP Data Services when trying to replicate data from a source system to a target system.
  Cause:
  The error message suggests that the replication process is attempting to use parallel processing for a specific table, but it has encountered a problem because the specified field does not exist in the source or target database. This can happen due to several reasons:
  
  Field Name Mismatch: The field specified in the error message may not exist in the source table or may have been renamed or deleted.
  Incorrect Configuration: The configuration for the replication might be incorrect, leading to the system looking for a field that is not part of the table structure.
  Data Model Changes: Changes in the data model (like adding or removing fields) after the initial setup of the replication can lead to this error.
  Replication Settings: The settings for parallel replication may not be compatible with the current structure of the table.
  
  Solution:
  To resolve the error, you can follow these steps:
  
  
  Verify Field Existence:
  
  Check the source table in the database to ensure that the field mentioned in the error message actually exists.
  If the field has been renamed or removed, update the replication configuration accordingly.
  
  
  
  Check Replication Configuration:
  
  Review the SLT or Data Services configuration to ensure that it is correctly set up for the table in question.
  Make sure that the mapping of fields is correct and that all required fields are included.
  
  
  
  Adjust Parallel Processing Settings:
  
  If parallel processing is not necessary for this table, consider disabling it for this specific table in the replication settings.
  Alternatively, if parallel processing is required, ensure that the table structure supports it.
  
  
  
  Reinitialize Replication:
  
  If changes were made to the table structure or replication settings, you may need to reinitialize the replication for the affected table.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to SLT or the specific replication technology you are using for any additional troubleshooting steps or known issues.
  
  
  
  Check for SAP Notes:
  
  Look for any relevant SAP Notes that might address this specific error or provide guidance on similar issues.
  
  
  
  Related Information:
  
  SAP SLT (SAP Landscape Transformation): A tool used for real-time data replication from SAP and non-SAP sources to SAP HANA or other target systems.
  Data Services: A data integration and transformation tool that can also be used for data replication.
  SAP Notes and Knowledge Base Articles: Always check the SAP Support Portal for the latest notes and articles that may provide solutions or workarounds for specific error messages.
  
  If the issue persists after following these steps, consider reaching out to SAP support for further assistance.