When you create a

mapping

task, you select the mapping for the task to use. The mapping must already exist before you can create a

mapping

task for it. Alternatively, you can create a

mapping

task using a template.

If the mapping includes parameters, you can define the parameters when you configure the task or define the parameters when you run the task. You can use user-defined parameters for data filters, expressions, and lookup expressions in a

mapping

task. You define user-defined parameters in a parameter file associated with the task.

At run time, a

mapping

task processes task data based on the data flow logic from the mapping, the parameters defined in the task, and the user-defined parameters defined in a parameter file, when available.