How to Over Ride IFC Parameter Mapping on Export

I am looking for help in how exactly to use the IFC_ExportOverrides.set file for export of IFCs from AECOsim.

I am finding that Data is being exported from the Family and Parts and being used as the material where as I would like the material to be driven from the Datagroup setting. As you can see below the Family Part "DrilledPier" has been used at the core instead of the Datagroup Material.

What mapping would I use to over write this on export?