Hi,
Ask your ABAPER to create 3 radio buttons in input screen with sub screen . So user enter only entered document number only one time and select one radio button for original or duplicate
example ZSD_BILL is my t-code,
when user entering to this code, in input screen three radio buttons will be display
first radio button for original
second radio button for duplicate
third radio button for triplicate
And it is very easiest to do for abaper
Hope it is helpful.