The subscription billing form is now available with the project after the release of 10.0.32. When the user inserts a line in the schedule then the first field is the item number as soon as the user entered or selects the item number, the system starts giving the alerts for required information which creates a disturbance in the filling of the information because the system must give time to the user for filling of the information, even after that user is not filling the information then the system starts throwing the alerts.

Here my suggestion is, to improve the user experience, these alerts should be performed during the saving of the form as working on other forms such as the purchase order form.