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control value instance combobox

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Level 4

hello


I have a combobox with item 20

with addInstance (1), etc.

until now everything function ok


my problem is to check the value of an instance??

what I mean if I choose the first item, and in the instance that I created, I select the first item again, I should have a message that tells me that I can not choose this option, you know how can I do??

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