Message type: E = Error
Message class:  CNV_10020 - Message class for package 10020 
Message number: 270
Message text: Select only rows with the same release
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_10020270 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that the system has detected that the data being processed includes rows that do not share the same release version, which is a requirement for the operation to proceed.
Cause: The error arises when the data set being processed contains entries from different software releases or versions. This can happen in scenarios such as: Migrating data from multiple systems that are on different versions of SAP. Attempting to consolidate data from different environments where the release levels are not aligned. Data inconsistencies in the source system where records have been created or modified under different release versions.
Solution: To resolve this error, you can take the following steps: Check Data Consistency: Ensure that all the data you are trying to migrate or convert comes from the same release version. You may
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10020269 Select only rows with the same sample target determination object
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10020268 & entries were deleted
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10020271 No determination path from &2 to &3 found
What causes this issue?  In package &V1&, the system searched for a determination path from &V2& to &V3&. No determination pat...
CNV_10020272 Package is org.-independent; no delimitation is planned
What causes this issue?  No target determination objects are defined for the blended package. This means that no delimitation is planned!How to fix th...
Click on this link to search all SAP messages.