By default,

Data Integration

adds the original source as Input Group 1 and maps the original source fields to the Union transformation output fields.

To review the recommended source and Union transformation, in the

Recommendations

tab, select

Show with Union

for the source that you want to review, and then click the

Show Me

icon. If you want to use the source with the Union transformation, in the

Recommendations

tab, click the

Accept

icon. In the mapping canvas, connect the Union transformation to the data flow.