Message type: E = Error
Message class:  CNV_CMIS_A_20 - Message class for Cross-Client Customizing Comparison (SLO) 
Message number: 105
Message text: Fields list selected from database
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_CMIS_A_20105 typically relates to issues encountered during data migration or conversion processes, particularly when using the SAP Conversion Management Information System (CMIS). This error indicates that there is a problem with the fields selected from the database, which may arise due to various reasons.
Cause: Field Mismatch: The fields selected from the database may not match the expected fields in the target structure. This can happen if there are changes in the database schema or if the wrong fields are selected. Data Type Issues: The data types of the selected fields may not be compatible with the target fields, leading to conversion errors. Missing Fields: Required fields may be missing from the selection, which can cause the process to fail.
Configuration Issues: Incorrect configuration settings in the migration tool or the source system can lead to this error. Database Connectivity: Issues with database connectivity or permissions may prevent the system from accessing
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_CMIS_A_20104 Global worklist items selected from database
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CMIS_A_20103 Worklist header selected from database
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CMIS_A_20106 Cannot find items for fields list; see long text
What causes this issue?  The <LS>Execute Technical Comparison</> activity was not executed successfully.System Response  The system issues...
CNV_CMIS_A_20107 Comparison results selected from database
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.