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

CNV_IUUC_DB_CONN121 - Overview

• 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.

CNV_IUUC_DB_CONN121 - Details

• 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