DAX Query Help!

Thanks mwegener 

I guess i was not clear before..

But the value isn't matching . Actually when i applied the DAX formula provided , the data is equivalent to below sql query (

filter of month in subquery)

select sum (f.forecast)
from
fact-forecast f,
dim-item d,

dim-date date
where
f.item_id = d.id

and f.date_wid = date.id

and date.month = 'April-2020'
and i.item_description in
(select distinct f.article_desc
from
fact-forecast f

where date_wid = '0420'
);

But i need DAX expression for below sql query

Should not take the month filter in the subquery. 

Ideally the data in the table is such a way that for same item_wid - item description is different in dimension and fact table

Can you pls suggest?

select sum (f.forecast)
from
fact-forecast f,
dim-item d,

dim-date date
where
f.item_id = d.id

and f.date_wid = date.id

and date.month = 'April-2020'
and i.item_description in
(select distinct f.article_desc
from
fact-forecast f);