Aspose::Words::Settings::Odso::set_FieldMapDatas method. Sets a collection of objects that specify how columns from the external data source are mapped to the predefined merge field names in the document. This object is never null in C++....Aspose::Words::Settings::Odso::set_FieldMapDatas method. Sets a collection of objects that specify how columns from the external data source are mapped to the predefined merge field names in the document. This object is never null in C++.