Managing user defined and pre defined categories

Hi @romanmg. It has taken me a while to implement this. I have set the Expense Category’s Choice source as suggested

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All looks good when I click on the dropdown arrow with categories from both searches showing

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But then when I choose one of the options nothing happens (or will sometimes show momentarily).

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If I go back to either search I can choose one of the options OK.

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What might I be doing wrong here???