In Catalog Counterparties, in ItemForm, there is a field called TIN.
I want field TIN length exactly 16.
User cannot enter more than 16 characters and if user enter less than 16 character, warning appears "Field must be filled with 16 characters"

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Dear Gigha,

look at the screenshots. This is also easy to do:

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Thank you, it works
I use it in OnChange in field TIN

When using the "OnChange" event, a message that the user has entered a too short number will be shown each time a character is entered. This can be inconvenient...

In general, it is considered good form to do all checks when recording (if this is a Catalog, for example) or when posting (if this is a Document).