You will use the dynamic view object (a view object populated from a SQL query) created earlier as the basis for a list of values. You will remove the CustomerId field from the form, and replace the field with an inputListOfValues component. This component displays as an input text field, with a button next to it which can be activated to display the list of values in a separate window. You will configure the list of values to display a subset of columns from the view object, and specify the relationship between the field and the value selected from the list
To configure the list of values, you will use List of Values dialog, which you can open from the Attributes page in the overview editor.