Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 635
Message text: Currently, column "Log" always contains an 'X' (see long text)
As more than &V1& entries exist in phase "Conversion", for <zh>
performance reasons</> it is not checked for every entry whether there
is a log or not. Consequently, from now on <ZH>an X will be entered in
column "Prt" for every entry.</> (this refers only to phase
<ZH>"Conversion"</>).
It is still possible to display a log if there is one (if there is no
log for an entry, a message will be issued in the status line).
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.
The SAP error message CNV635, which indicates that the column "Log" always contains an 'X', typically arises in the context of data migration or conversion processes, particularly when using SAP's tools for data transfer or transformation.
Cause: The error message suggests that there is an issue with the logging mechanism in the data conversion process. The 'X' in the "Log" column usually signifies that a log entry has been created for that particular record. This can occur due to various reasons, including: Data Quality Issues: The data being processed may have inconsistencies or errors that trigger logging. Configuration Settings: The logging settings in the data migration tool may be set to always log entries, regardless of their status. Process Errors: There may be errors in the conversion process that are causing all records to be logged as problematic.
Solution: To resolve this issue, you can take the following steps: Review the Logs: Check the detailed logs to identify
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV634 Average data throughput per second (read/sec or upd/sec): &1.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV633 Please select a package (see input help)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV636 Now the correct value is displayed in column "Log" again.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV637 Column width was optimized and display was refreshed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.