Message type: E = Error
Message class:  CNV_10100 - Messages from package 10100 
Message number: 250
Message text: Check for new set name &1 (for set &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 CNV_10100250 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there is an issue with the set name being used in the migration process.
Cause: The error message CNV_10100250 suggests that the system is unable to find or validate a new set name that is expected for the specified set. This can happen due to several reasons: Incorrect Set Name: The set name provided does not exist or is misspelled.
Configuration Issues: There may be issues with the configuration of the migration project or the data migration settings. Data Inconsistencies: The data being migrated may not conform to the expected structure or format, leading to validation failures. Missing Customization: If the migration involves custom fields or structures, they may not be properly defined or activated in the target system.
Solution: To resolve the CNV_10100250 error, you can take
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10100246 Generated set name &4 for set &1 &2 &3 already exists, see mapping table
What causes this issue?  The system could not assign a unique set name in the generated set name mapping table.System Response  The conversion require...
CNV_10100245 Break down of set interval for set class &1 not required by conv. package
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100251 No new set name assigned to duplicate set record &1 &2 &3
What causes this issue?  For each duplicate set record a new set name has to be defined.System Response  The system cannot proceed without an assigned...
CNV_10100252 New set name &1 of set &2 &3 &4 belongs to variable
What causes this issue?  The system issues an error message and will not allow you to continue with this transaction until the error is resolved. Syst...
Click on this link to search all SAP messages.