SAMEPERIODLAST Year some items are missing if current year is selected

[mrchonginhk]

In my data, 2018 includes items A,B,C only (eg values 10, 20, 30)
2017 contains data for item A, B, C, D (eg values 15,25,35,45)

In my Matrix report in PowerBI, I am showing 3 columns:-

Item, 2018Values, 2017Values

2017Values is a DAX measure created using SAMEPeriodLastYear.

Then I have a filter selecting Year.

When I select year 2018 in slicer,
2017Value (ie lastyear) column is showing correctly.

However, what is missing is item D is not in my report. Now it is shown as

Item , 2018 , 2017
===============
A , 10 , 15
B, 20, 25
C, 30, 35

The problem I have now is D actually is a 2017 item but it is not showing in the above Visual. What I need is:-

Item , 2018 , 2017
===============
A , 10 , 15
B, 20, 25
C, 30, 35
D, 0, 45

What can I do to ensure D is also shown while year 2018 is selected ?
Thanks

 

[SpillerBD]

Is the value actually zero or null?
Do you have any value filters in the Pivot or the Query that exclude zero or null values?