- Because the values in a Combo Box Custom Field are restricted to the semi-colon delimited list in the Values field, the Allow Empty field has a slightly different behaviour than usual. It controls whether or not the record can be saved with the default value (which is the first value listed in the Values section):
- If Allow Empty is checked, the record can be saved with the default value.
- If Allow Empty is not checked, the record cannot be saved with the default value. In this way you can force the user to select a value different from the default value.
- Important: Because the record cannot be saved with the default value, the first item listed in the Value section should be either a space followed by a semi-colon (if you want the field to start out blank) or an instruction to the user such as -----Select One-----; Please choose; or similar. You do not want an actual value as the first item, since the record can never be saved with the first value if Allow Empty is deselected.