DAX measure that brings data from related table and avoids duplicates

[segev200]

Hi all, I have two tables that are connected with a key (Product-Year-Quarter) as shown in the picture. I need help creating a measure that will show Product quantity if I use "Product" field from my main table without creating duplicated values (since my main table have multiple rows with this key).

Appretiate your help.

[tamerj1]

Hi @segev200 

please present sample of the expected output 

[segev200]

if I use just sum, I get 60 instead of 15