I have write cashier program, now question,
i'm sorry, I can't clear my problem.
I try sound:
step:
product code "402" first scan, qty x1
this is build one elem.
again, code "407" scan, qty x1
this is build 2 elem.
again, code "402" scan, qty x7
this is build 3 elem.
you can see List4, List5
is correct show,
402 = 2 record
407 = 1 record
but I hope changed:
402 = 8 record
407 = 4 record.