Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 514
Message text: There are no critical merge groups for chart of accounts &1
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 CNV_20100514 indicates that there are no critical merge groups for the specified chart of accounts (COA) in the context of a data migration or conversion process. This error typically arises during the use of the SAP S/4HANA Migration Cockpit or during data migration activities where the system is trying to merge or convert financial data.
Cause: Missing Merge Groups: The error suggests that the system could not find any defined merge groups for the specified chart of accounts. Merge groups are used to define how different accounts should be combined or merged during the migration process.
Configuration Issues: There may be a configuration issue where the merge groups have not been set up correctly in the system. Data Inconsistencies: There could be inconsistencies or missing data in the source system that prevent the identification of merge groups.
Solution: Check Merge Group Configuration: Go to the transaction code OBY6 (or the relevant configuration transaction)
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20100513 Item category assignment for source account &1 is deleted
What causes this issue?  During the chart of accounts conversion, the system tries to merge an account that does not have an item category assigned wi...
CNV_20100512 Item category assignment for source account &1 is changed from &3 to &4
What causes this issue?  During the chart of accounts conversion, the system tries to merge accounts into the new account (&V2&) that have dif...
CNV_20100515 Critical item category changes identified; see long text
What causes this issue?  The system identified that old accounts with different item categories are merged into a new account . As a consequence, the ...
CNV_20100516 No critical item category changes identified
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.