Message type: E = Error
Message class:  CNV20400 - Message class CNV20400 
Message number: 010
Message text: &1 &2 &3 &4
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 CNV20400010 typically relates to issues encountered during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. The message format usually includes placeholders (&1, &2, &3, &4) that provide specific details about the error, such as the object type, the specific record, or the reason for the failure.
Cause: The causes of this error can vary, but common reasons include: Data Inconsistencies: The data being migrated may not meet the required format or constraints in the target system. Missing Dependencies: Certain required fields or related data may be missing in the source data.
Configuration Issues: The target system may not be properly configured to accept the incoming data. Mapping Errors: There may be issues with how the source data is mapped to the target fields.
Solution: To resolve the CNV20400010 error, consider the following steps: Review the Error Details: Check the specific details provided in the error
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV20400009 No objects are merged
What causes this issue?  No entries of type A -> C and B -> C were found during the analysis. This means that no objects will be merged during t...
CNV20400008 Mapping is org-dependent
What causes this issue?  The fields ORG_EINH or ORG_EINH2 of mapping table CNVRENAME contain entries for organizational units. The conversion is carri...
CNV20400011 Temporary duplicates may occur during the conversion
What causes this issue?  The mapping values may result in <DS:TX.CNV_MBT_TEMP_DUPLICATES>temporary duplicates</>. Entries of type A -> ...
CNV20400013 No fields for conversion found in the specified tables
What causes this issue?  The table of fields for conversion (CNVFIELDS) does not contain any values for the specified tables. A merge of objects can b...
Click on this link to search all SAP messages.