When you add a reusable transformation to a mapping, the transformation parameters are transformation parameters until the parameters are exposed as mapping parameters. If you expose the transformation parameters as mapping parameters, you bind the transformation parameters to the mapping parameters. The mapping parameters have the same name and type as the transformation parameters. The default value of the mapping parameter uses the instance value of the reusable transformation parameter.

To override the parameter value in a reusable transformation, complete one of the following tasks:

Create a new mapping parameter to override the transformation parameter.
Expose the transformation parameters as mapping parameters. Reconfigure the default value of the mapping parameters.
Expose the transformation parameters as mapping parameters. Configure a parameter set or a parameter file to override the default value of the mapping parameters.

For example, you can set a parameter for a reusable Filter transformation. When you add the reusable Filter transformation to a mapping, you can configure a mapping parameter to override the Filter transformation parameter, or you can expose the Filter transformation parameter as a mapping parameter. If you expose the Filter transformation parameter as a mapping parameter, the Filter transformation parameter binds to a mapping parameter. To override the exposed transformation parameter, reconfigure the default value of the mapping parameter that binds to the transformation. The transformation uses the default value of the mapping parameter at run time.