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The term invalid data can have lots of meanings. Access won't accept things like trying to type text into a number field, as that is clearly invalid. However, unless you specify values that are invalid for a number field, like setting a maximum value that can go in, then it will accept it. So some invalid data is determined by Access, such as the wrong data type in a field, and some invalid data is determined by the user who wishes to only allow certain data in certain fields. Implementing that kind of validation is down to the person designing the database. There are many ways of doing that and that is part of the skill of the designer of the database and clearly specifying in the design what data is valid and what is invalid.

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