@Unavailable (Formula Language)
Deletes the value of an editable field.
Syntax
FIELD fieldName := @Unavailable
Usage
This function works in agent, view action, and toolbar button formulas.
If the field has a default value, the default value is reinstated after this function deletes the current value.
This function is the same as @DeleteField.
Do not use this function to test to see if a field is unavailable. Use @IsUnavailable instead.
Examples
This formula creates a field named NewDate and sets it to today's date, then removes the field named OldDate from the document.FIELD NewDate:=@Today
FIELD OldDate:=@Unavailable;