I just noticed that I have two categories named "Dividend Income" -- one is inside the master category "Investments" and the other is inside the master category "Personal Income." See first screenshot. This is creating some confusion for my accountant.
I figured that, since all of my investments are in investment accounts, it made more sense to standardize all these transactions into Investments: Dividend Income. (Please let me know if I'm wrong on this.)
So I did a search for all my transactions that are tagged Personal Income: Dividend Income. I went into one, and tried to change its category to Investments: Dividend Income. But in that popup menu, I can't find Investments: Dividend Income! See second screenshot.
Why? And how to fix?