You can add a mapplet to a field mapping. After you add a mapplet to a field mapping, you must map the source fields to the input fields of the mapplet and map the output fields of the mapplet to the target fields.

When a source field is mapped directly to a target field and you map an output field of a mapplet to the same target field,

Data Integration

concatenates the values of the source and output fields in the target field. Verify that the expression is correct for the target field.