Adding- autofill discount option in customer/supplier

My request have nothing to do with pricing, i am just requesting for autofill option of discount field in edit forms. Instead it would allow for Unit price to remain same preserving uniformity across different edit & view forms

“Autofill-due date -sales invoice” option when selected & filled in customer already autofills due date field in invoice edit screen when that same customer is selected

This means that the program is already searching through customer name from customer database before filling out due date box in edit screen with autofill due date value which we have already defined in customer page

Similarly why cannot program search through customer name first & then item name before autofilling discount field?