Method that sets the base quantity for the component.
| Name | Type | Description |
| QuantityType | BOMQuantityTypeEnum | Input BOMQuantityTypeEnum indicating the quantity type. If kParameterBOMQuantity is set, a Parameter needs to be specified as the second argument. |
| Quantity | Variant | Input Variant specifying the quantity. If QuantityType is kParameterBOMQuantity, this argument expects a Parameter input, else this argument can be left unspecified. Only such parameters whose units resolve to being a linear length, a volume, or a mass are valid. This is an optional argument whose default value is null. |