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.mendixcloud.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!