The Edit Account Structure form will show the same fields as that of Account Structure to give you still the ability to modify it without going back to Account Structure form. In this form, you will see all the valid mask characters accepted by the system.
The OK button will close and save the Edit Account Structure form.
The Cancel button will close the form and will not save any changes you have made.
Press F1 or click F1-Help button at the bottom left of the form for help on the form that is currently opened.