Message type: E = Error
Message class:  CNV_10100 - Messages from package 10100 
Message number: 030
Message text: Setclass &1 not found.
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_10100030: Setclass &1 not found typically occurs in the context of data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that the system is unable to find a specific set class that is required for the operation being performed.
Cause: Missing Set Class: The specified set class (denoted by &1) does not exist in the system. This could be due to a configuration issue or because the set class was not created or activated. Incorrect Configuration: The migration or conversion process may be referencing a set class that is not properly configured or has been deleted. Transport Issues: If the set class was recently transported from another system, it may not have been transported correctly or may be missing dependencies.
Solution: Check Set Class Existence: Use transaction code SE11 (Data Dictionary) to check if the set class exists. Enter the name
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10100020 Lower/upper limit for swap: &1 &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100018 Overlapping single values: &1 and &2 - &3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100031 Missing Setclass &1 could not be inserted!
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100032 Target Client &1 already in use!
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.