Message type: E = Error
Message class:  CNV_10100 - Messages from package 10100 
Message number: 326
Message text: Number of checked sets: &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_10100326, which states "Number of checked sets: &1," is typically associated with data migration or conversion processes, particularly when using SAP's Data Migration tools or the SAP S/4HANA Migration Cockpit. This message indicates that a certain number of data sets have been checked during the migration process, but it may also imply that there are issues or warnings related to the data being processed.
Cause: Data Quality Issues: The error may arise due to inconsistencies or issues in the data being migrated. This could include missing mandatory fields, incorrect data formats, or violations of business rules. Configuration Problems: There may be issues with the configuration of the migration tool or the mapping of fields between the source and target systems. Technical Limitations: The number of records being processed may exceed system limits or thresholds set in the migration tool.
Solution: Review Logs: Check the detailed logs generated during the migration process. These
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10100325 No subclass mapping values found for set class &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100324 No duplicate set values found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100327 Number of updated sets: &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100328 Set value &1 exists more than once
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.