Usage of this parameter is dependant on function definition id and ItemType :
3 (Rectangles) ItemType: Eplan::EplApi::Base::Enums::ItemType::DrillingRectRounded - diameter3 (Rectangles) ItemType: Eplan::EplApi::Base::Enums::ItemType::DrillingRectChamfer - chamfer lengthIn other cases this parameter is not used.