You can update this though the BC stalk but it will appear differently in the Digital Service. I've seen this recently in an F30.
I was able to remove this entry using ISID and then re-enter the entry with ISID so it appeared as it would if the dealer updated the service action.
In fact I think the dealer entries were in green and the manual resets were in orange. I would need to double check that.

Finally I am not 100% what way the service entry would appear if the item was reset using the BMW Carly App. I have a feeling that it appears just like the dealer entry.

I should have taken screen shots from the iDrive and ISID when I was doing this...