Use the Auto order in the Type field to have TWS select the order type based on the price values you enter. This feature is a short-cut to save you the step of having to choose the order type first and then define the price criteria.
By default, the (Auto) order appears in the Type field. Click to view the current list of supported auto order types from which TWS will choose. The chosen order type will display in the order description line. It is important to note the following:
Only the order types listed under the (Auto) entry are eligible to be selected as an Auto order. All other order types must be selected manually from the Type dropdown list.
The Auto order appears in the Type field only for NEW orders. Working orders will display the actual order type in the Type field.
The Auto order type selection is made according to the rules as illustrated in the image below.