When adding a new contingent value, you have specified a field value when the field value should not be specified.
If the contingent value is of type any or null, you cannot specify a field value since it is assumed from the field type. If you have chosen the type: any, you cannot specify a field value since the field value can be any value. If you have chosen the type: null, the field value is set to null.
If you want to specify a specific field value, you can use a coded value domain or range type of contingent value.