Message type: E = Error
Message class:  CNV_MBT_IS - Message Class of Industry Solutions 
Message number: 016
Message text: Invalid call to the merge function module for object type Activity
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_IS016 indicates that there is an invalid call to the merge function module for the object type "Activity" during a data migration or conversion process. This error typically arises in the context of SAP's Migration Cockpit or during data transfer processes where data is being merged or transformed.
Cause: Incorrect Configuration: The merge function module may not be correctly configured for the specific object type (in this case, "Activity"). This could be due to missing or incorrect settings in the migration project. Data Integrity Issues: There may be issues with the data being processed, such as missing required fields or invalid data formats that prevent the merge function from executing properly. Custom Code Issues: If there are custom enhancements or modifications in the system, they might interfere with the standard merge function module. Version Compatibility: The error could also arise if there are compatibility issues between the version of 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_MBT_IS015 & & ,can not be merged with the Std.TDMS process. Error: Table-& client-&
What causes this issue?  For the object &V2& of object type '&V1&', the merge operation could not be performed. While mergin...
CNV_MBT_IS014 Activity & not found in the table CNVMBTACTPARAMS.
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_IS017 Invalid Copy Variant &
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_IS018 Insert Failed for object type & Object &
What causes this issue?  For the object  &V2& of object type '&V1&', the insert operation could not be performed. While inse...
Click on this link to search all SAP messages.