Message type: E = Error
Message class:  CNV_10100 - Messages from package 10100 
Message number: 275
Message text: Set appears more than once; &1 (&2)
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_10100275, which states "Set appears more than once; &1 (&2)," typically occurs during data migration or conversion processes, particularly when using SAP's Data Migration tools or during the execution of certain programs related to data conversion.
Cause: This error indicates that a specific set of data (identified by the placeholders &1 and &2) is being referenced multiple times in a context where it should only appear once. This can happen due to: Duplicate Entries: The data being processed contains duplicate entries that violate the uniqueness constraint expected by the system. Incorrect Configuration: The configuration settings for the data migration might not be set up correctly, leading to the same set being processed multiple times. Data Integrity Issues: There may be underlying data integrity issues in the source data that need to be addressed before migration.
Solution: To resolve this error, you can take the following steps: Identify Duplicates: Check the data set being processed
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10100274 Overlapping values, or sets appear more than once, for set &2 (set ID &3)
What causes this issue?  For this set an ambiguity check was completed and overlapping values exist or sets appear more than once.How to fix this erro...
CNV_10100272 Ambiguity check of set &1 &2; no errors detected
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10100277 Set &2 (set ID &3) with overlapping area
What causes this issue?  Overlapping areas were found for the set data.How to fix this error?  For more details, we recommend that you verify these re...
CNV_10100278 Overlapping area &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...
Click on this link to search all SAP messages.