Message type: E = Error
Message class:  CNV_CDOP_UCIA - CDOP Upgrade/Change Impact Analysis 
Message number: 020
Message text: & customer objects were found to be affected by change in SAP objects
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_CDOP_UCIA020 typically relates to issues encountered during the conversion or migration of data, particularly in the context of SAP's Conversion and Migration tools. This error indicates that customer objects (custom developments or configurations) are affected by changes in SAP standard objects, which can lead to inconsistencies or conflicts during the upgrade or migration process.
Cause: Changes in Standard Objects: The error usually arises when there are changes in the SAP standard objects (like tables, fields, or structures) that conflict with custom objects created by the customer. Incompatibility: If the custom objects rely on specific fields or structures that have been modified or removed in the new version of SAP, this can lead to issues. Data Model Changes: Changes in the underlying data model during an upgrade or migration can also trigger this error, especially if the custom objects are not aligned with the new model.
Solution: Analyze the Impact: Use the SAP
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_CDOP_UCIA019 & objects found in the given set of transport requests
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CDOP_UCIA018 & distinct SAP objects have been selected from the Analysis System.
What causes this issue?  &V1& distinct SAP objects have been selected from the Analysis System.System Response  The activity "Find Used S...
CNV_CDOP_UCIA021 & SAP objects used in custom objects were changed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CDOP_UCIA022 & objects found in customer namespace
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.