Message type: E = Error
Message class:  CNV_MBT - PCL message class 
Message number: 874
Message text: Start copying Include & in Control system ...
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_MBT874 typically occurs during the execution of a data migration or conversion process, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an issue with copying an include program in the control system, which is often related to the migration of data from legacy systems to SAP S/4HANA.
Cause: Missing Include Program: The include program that the system is trying to copy may not exist in the specified location. Authorization Issues: The user executing the migration may not have the necessary authorizations to access or copy the include program. System Configuration: There may be configuration issues in the control system that prevent the copying of the include. Transport Issues: If the include program is part of a transport request, there may be issues with the transport not being released or imported correctly.
Solution: Check Include Program: Verify that the include program mentioned in the error
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_MBT873 Error while copying Include & in Remote system (Destination & ) .
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT872 Error while copying Include & in Control system
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT875 Start copying Include & in Remote system (Destination & ) ...
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT876 All Includes are already synchronized - No action required .
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.