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Applying mapping overrides
Transforms contained in a mapping overrides group are applied after a parent transform is applied. This function enables you to copy a complex type from the input to the output object, while updating some of the child elements in the complex type.
You can create a graphical data map that performs a simple copy of a complex type, by wiring a Move transform from the input to the output object. You can also add additional transforms that have an output element that is a simple type within the complex type. As the parent is already mapped, the Graphical Data Mapping editor provides you will the option of creating a quick fix to create an overrides group:

The transforms contained in the overrides group are applied after the parent transform is applied:
