Distinct count of a value one time a day and increment

[Sales_operation]

Dears

I Want to count (distinct) each item one (1) time on a day (no matter it's repeating on the same day) and increment the count with 1 if it exists on another day and so on...

Date	INVOICE_NUMBER	Cust Code	ITEM ID
07-07-19	N_017040	1212	Item1		Item1	2
07-07-19	N_017040	1212	Item1		Item2	2
07-07-19	N_017040	1212	Item1		Item3	2
07-07-19	N_017040	1212	Item6		Item4	1
24-07-19	N_017835	1212	Item1		Item5	1
24-07-19	N_017835	1212	Item1		Item6	2
24-07-19	N_017835	1212	Item2
24-07-19	N_017835	1212	Item2
24-07-19	N_017835	1212	Item2
24-07-19	N_017835	1212	Item3
24-07-19	N_017835	1212	Item4
24-07-19	N_017835	1212	Item4
24-07-19	N_017835	1212	Item6
27-07-19	N_017981	1212	Item2
27-07-19	N_017981	1212	Item2
27-07-19	N_017981	1212	Item3
27-07-19	N_017981	1212	Item5