CalculatedField.UserDefinedFormula

True if this is a user-defined formula.

public sealed bool UserDefinedFormula { get; set; }

Remarks

We need to know this because user-defined formulas aren't stored with fields in the data dictionary but instead in a user-defined formulas table. That way, installing an update with a new data dictionary doesn't overwrite the user's formulas.

See also:

Class CalculatedField