Parameter Reference
This section describes how to reference the parameters from the script.
- ParameterReference
 By declaring the ParameterReference association class in the field, you can refer to the parameter.
- FlexibleField
 Using the FlexibleField association class, you can select and reference constant values, parameter reference, or data flow input.
- Type of constraints that reference
 For some fields, you can specify the attribute to constrain the referenced type.