You can parameterize some properties in objects and transformations. If you assign a parameter to a property, the option to assign a parameter appears when you configure the property value.

For example, you can create a Read transformation in a mapping. The Read transformation is a non-reusable transformation that you create based on a physical data object. You can assign parameters to the transformation properties, or you can assign parameters to the physical data object.

You cannot nest user-defined parameters within a parameterized source. If the source data object is parameterized, you cannot expose a user-defined parameter as a mapping parameter to override the parameter values at run time. The mapping uses the default value instead.

The following table lists the objects and the fields where you can assign parameters: