I have a dozen or so warnings in a large model that display the message: "Action activity that has a side effect on the client is not recommended here because the microflow is used as a data source for data view 'dataView1'" I found the following thread: https://forum.mendix.com/link/questions/4523 ... which is great as an explanation, but doesn't offer a solution. In addition, it would appear in the cases I have that there is a slight difference: unless I'm mistaken, the action (Change Jaarplanning) IS a system action. Many thanks!
Changing an objcet is indeed a standard action. However, you might not need the "refresh in client" option set to true. That is the " side effect on the client" the warning is about.