Field Default - PreSave Property

Default values can be generated upon the addition of a new record or upon the saving of the new record. The PreSave check box controls when the Default code is evaluated and a result placed in the field.

       Not Checked: If the PreSave check box is not checked, the Default code is evaluated and the result placed in the field upon the addition of the record.

       Checked: If the PreSave check box is checked, the Default code is evaluated and the result placed in the field upon the saving of the new record. 

Tip Record Saving: Since it's common for developers to want to insert code just before a record is saved, you will find a tip that will help you determine where to insert your presave code at Error! Reference source not found..

More:

Field Audit Trail Options Property