Larry, thank you for your reply. Actually, that’s not quite what I want, because I don’t want any dates to change (no moving of Start and Finish). The task has not started later than planned, the resource just did not do the amount of work as planned in the first week. I guess I could achieve that with the 3rd box (Move start of remaining parts before status date forward to status date), then at least the Start would not move. I would then have to set the Task Type to Fixed Work and change remaining duration to 5 days so the units will be increased and the task is still completed as originally planned.
However I now have a split in my task which is not really what I want. The resource did interrupt work on this task, they just worked less hours per day than planned. Larry, is there a way to achieve that?