The Mapping Output Specification step is an output placeholder used inside a mapping sub-transformation.
Use this step to define where the parent transformation can read output rows from the sub-transformation.
You can think of it as a special output step that passes rows back to the parent transformation at runtime.
Mapping Output Specification dialog
When to use
Use Mapping Output Specification when your transformation is designed to be executed as a mapping (for example, from the Mapping step or the Simple Mapping (sub-transformation) step).
