While investigating https://bugs.kde.org/show_bug.cgi?id=313237 (and https://git.reviewboard.kde.org/r/107714/) I found some possible problems -
"
>> Select a valid tag and the OK button will be enabled even if the schedule
>> name is empty.

> Paraphrasing Alvaro, it's a bit of a bag of worms here, still. (the general area, not TAGS)  I 
> don't see entering just a tag enabling the OK button, but entering a tag and immediately
> clicking in the memo field does, and it also clears the tag.  In fact, entering
> text in the tag field, then clicking any input widget in the transaction area,
> clears the tag, removes it from the drop-down, and enables the OK button.  With
> a new schedule, entering two characters in the memo field, then entering an
> amount, then adding a third memo character enables the OK button.
"
"> I'm not sure, either, that the Tag widget operation is as expected, in that any entered text
> is cleared if another editable widget is selected, or if tab is clicked.  Should the user be
> cautioned, as for the payee?  I'll leave that for the author."


Reproducible: Always

Steps to Reproduce:
See above.