Message type: E = Error
Message class:  CNV10400 - Messages for package 10400 (characteristics) 
Message number: 063
Message text: In total, &1 characteristics still to be confirmed as Cannot be Converted
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message CNV10400063 indicates that there are still characteristics in the data conversion process that have not been confirmed as "Cannot be Converted." This typically occurs during data migration or conversion processes, particularly when using SAP's Conversion Tools or during the transition to S/4HANA.
Cause: Data Incompatibility: The characteristics in question may not be compatible with the target system or data model. Missing Mapping: There may be missing or incorrect mappings for the characteristics that need to be converted. Incomplete Configuration: The configuration settings for the conversion process may not be fully set up, leading to unconfirmed characteristics. Data Quality Issues: The source data may contain inconsistencies or errors that prevent successful conversion.
Solution: Review Characteristics: Identify the characteristics that are still pending confirmation. This can usually be done through the conversion tool's logs or reports. Check Mapping: Ensure that all necessary mappings for the characteristics are defined correctly. This may involve reviewing the mapping tables
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV10400062 Characteristic &1 confirmed as "Cannot be Converted" on &2 at &3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV10400061 Characteristics which are set to "Cannot be Converted"
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV10400064 Tables which are prepared for characteristics conversion
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV10400065 Values for characteristics in table &1 will be converted
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.