Date relevant expression

[My_Rebecca]

I need to calculatethe quantity with day GR_Date is greater or equal to variable Last Month End Day.

"Last Month End Day" has been reached as variable.

How to correct following expression?

count({<GR_Date>={"$(Last Month End Day)"}>}distinct(GR_Number&[GR_Line No.]))

[Chanty4u]

Try this 

count({<GR_Date={">=$(=MonthEnd(AddMonths(Max(GR_Date), -1)))"}>} distinct GR_Number & GR_Line No.)

[My_Rebecca]

"Last Month End Day" has been reached as variable. Your expression does not work.

[Chanty4u]

Can you attach full screen

Just wanted to see the results below in expression editor area 

[My_Rebecca]

[My_Rebecca]

Dear @Chanty4u , could you please take a look at this issue? I would not get the correct answer.