Help in Set Expression

[qlik4asif]

Hello All,

I have table in front end with fields as below

1.MATNR_NOlevel --> Dimension

2.No of days   --> Set Exp as below

Min({<Daywise_Orders_Cum={">= $(=Sum(Available_Stock))"}>}Date)

The above expression is working when i select ant MATNR_NOlevel, but without any selection i am getting as null for all MATNR_NOlevel.

How to solve this

Thanks in advance

[qlik4asif]

Please the below sample data with expected output