Dependent columns are defined by adding them to the Application Data Model. The following prerequisites apply for the column to be defined as dependent:
A valid dependent column should not already be included for masking.
The column should not be a foreign key column or referenced by a foreign key column.
The column data should conform to the data in the parent column.
If the column does not meet these criteria, an "Invalid Dependent Columns" message appears when you attempt to add the dependent column.