CALCULATE function with DATEBETWEEN function showing NULL values

[rashesh]

Hi All,
I have three tables ("Date Table", "Inventory", and " sales" ). I want the last 30 days' sales of quantity for each item from the "current date"(This column in the "Inventory" table). I have tried but it showing blank.

 Sales Table

Date TableInventory Table                                                                   
   I have tried the below measures 

                 

MY OP:-

And please tell me why this is happening and what's the solution. 

Thank you!! @amitchandak @Ashish_Mathur @ValtteriN 

[Ashish_Mathur]

Hi,

Your question is not clear.  Share data in a format the can be pasted in an MS Excel file and show the expected result.

[wdx223_Daniel]

1, you need to mark Calendar Table as Date Table

2, Create one-to-many relationship from Calendar to Inventory, and to Sales

3, try this measure

 Last30Days=VAR _date=Max(Inventory[Current Date]) VAR _item=MAX(Inventory[Item_ID]) RETURN CALCULATE(SUM(Sales[Quantity]),DATESINPERIOD(Calendar[Date],_date,-30,DAY),Sales[ItemID]=_item)

[rashesh]

Hi Daniel,
Thanks for Ans but it is not working. and still getting the same error as before.
And for your second point I can not able to make the relationship between the calendar and inventory and when I try to it is creating inactive.