The Field property identifies a field in the application screen that an action is supposed to affect. For example, in the Input action, the Field property identifies the field into which the input text is to be typed.
To set the value of the Field property, you can use the following quick and easy method:
In the Outline view, select the action that you want to modify.
Move the mouse pointer over the screen image displayed in the Actions tab. As the mouse pointer moves over each field in the screen image, the screen operations editor displays the field's default name (such as Field901).
Click the field whose identifier you want to use in the Field property. A red marking rectangle appears around the field, and the identifier for the selected field (for example, OperatorIn_1ns:Field901) is written into the Field property
To select some other field, use either of the following methods: