Microsoft Access 2007 - Allow only certain values in attribute

Question

I am incredibly new to Microsoft Access, and would really appreciate some help with this. I am creating a database for a fictional estate agency, that deals with the selling of local property. The property is submitted into it's own relation, with an identifier and it's details. One of these details is it's postcode. As the "company" deals exclusively with local properties, I need to find a way to only accept one of three values for the postcode: AA1*** AA2*** AA3*** The asterisks are random values - I am not too concerned about validating the input against existing postcodes, merely wishing to only accept postcodes beginning with one of those three values.

A point in the right direction would be much appreciated!

Answer 1

In desin-mode of the table got to the properties of the field (in the lower part of the screen) - there you can set this.