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Validation rules can be set in either table design or table datasheet view.
There are three types of validation rules in Access: By default, Access displays list data in a combo box control, although you can specify a list box control.
In some cases, such as a Long Text field, you can enter any data that you want.
In other cases, such as an Auto Number field, the data type setting for the field prevents you from entering any information at all.
If the query for the lookup list is based on a table, you identify that table and the field that contains the data that appear in the list.
The data type that you set for each table field provides the first level of control over what type of data is permitted into a field.
To remove data from a value list, open the table and edit the items.
Removing data from a lookup list requires additional steps, and those steps vary depending on whether the query for the lookup lists takes its data from a table or another query.
The following table lists the data types that Access provides, and describes how they affect data entry.
For more information, see Data types for Access desktop databases and Modify or change the data type setting for a field.