Message type: E = Error
Message class:  CNV_MBT_46 - PCL message class 
Message number: 067
Message text: ACTIVITY_ID not selected
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_MBT_46067 with the description "ACTIVITY_ID not selected" typically occurs in the context of data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that a specific activity ID, which is required for the migration process, has not been selected or is missing.
Cause: Missing Activity ID: The most common cause is that the required activity ID has not been selected in the migration cockpit or the relevant migration tool.
Configuration Issues: There may be issues with the configuration of the migration project, leading to the activity ID not being recognized. Data Mapping Issues: If the data mapping is not correctly set up, it may lead to the system not being able to identify the necessary activity ID. Authorization Issues: Lack of proper authorizations for the user executing the migration can also lead to this error.
Solution: Select the Activity ID: Ensure that the required
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_MBT_46066 Root Node can't be 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_MBT_46065 Node contains child deletion not allowed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT_46068 Attribute name unknown
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT_46069 Node cannot be added; allowed maximum level is 5
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.