I will try to explain the answer with the help of an example of “Status” field.
We will assume the following values have been given for Pre-Default and Post-Default properties of Status Field
Pre-Default Value: “In Process”
Post-Default Value: “Complete”
Following are the scenarios which can take place:
User creates a New Record and saves the record without changing value of status field:
Pre-Default value (In Process) will be assigned to Status field.
User creates a New Record and changes the value of Status field to “Planning”
Pre-Default value is going to take effect as soon as user creates a new record but Post-Default value will not take effect. [Corrected as pointed by Gururaj]
User creates a New Record and changes the value of Status field to blank
Post Default Value (“Complete”) will take effect
User copies an existing record where value of status field is “Planning”
Neither Post-Default nor Pre-Default will take effect
User copies an existing record where value of status field is blank
Pre-Default (“In-Process”) Value will take effect
User copies an existing record and makes the value of the field as blank
Post-Default Value (“Complete”) will take effect
User changes the value of existing record to blank and saves the record.
Neither Post-Default nor Pre-Default will take effect as these values only takes when the record is initially created and saved.
Click here to get more details about Pre-Default and Post Default properties
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