Sum, subtract in count return 0 count Qlik Sense

[Mgrande]

I am trying to count customers are greater less than 0 in saless subtracting total sales between two years in a KPI, but do not count all rows :

=count({<[Customer_id] = {"=(Sum({<Year={$(=Max(Year))}>}[sales])-Sum({<Year={$(=Max(Year)-1)}>} [sales]))<0"}>} distinct [Customer_id] )

The result of count is 14, and it must be 16. 

In the table it count two rows like 0

[customer_id]	Sales (2021)	Sales (2020)	Sales	subtract Result	Count(distinct [customer_id])
0900007	21810,7	26260,59	Down	-4449,89	1
0900014	6794,36	8295,13	Down	-1500,77	1
2400004	47445,43	49895,94	Down	-2450,51	1
2400009	6326,87	6505,95	Down	-179,08	1
2400014	0	9724,89	Down	-9724,89	0
2400015	0	20893,03	Down	-20893,03	1
2400016	2858,46	3571,75	Down	-713,29	1
2400019	109278,07	120445,45	Down	-11167,38	1
2600002	21903,16	28260,08	Down	-6356,92	1
2600003	9616,61	10919,84	Down	-1303,23	1
3400010	0	530,76	Down	-530,76	0
4000006	5029,8	6407,28	Down	-1377,48	1
4000008	2857,98	3748,14	Down	-890,16	1
4000009	116,44	866,36	Down	-749,92	1
4000012	1609,21	2504,88	Down	-895,67	1
4000015	-274,68	1194,93	Down	-1469,61	1

[Andrea_Bertazzo]

Hi @Mgrande 

the formula seems to be correct. Could you, please, share a copy of the QVW / QVF ?

[Mgrande]

Hi @Andrea_Bertazzo ,

I'll try but it will take time, it's too big, I have to drop tables which doesn't affect this issue. Thanks