Reference fields are very powerful fields which make it possible to connect Forms to other Forms or to the Geodatabase. Users can link the Records they add to a Form to the Records of another Form.
To link a Record of one Form to a Record of another Form you need to use as common reference:
- a Key field or
- a Serial Number field
The maximum length of the characters of a Key field to appear in a dropdown result of a Reference field is 128 characters.