User Defined list and No Values

Summary

Report & filtering out using user defined list

Content

Hi There,

I've created a report that has a user defined list ($Locations). This variable is used to filter out records on the report. However, I have some records with No value on the Location column. I want to include these records (with No value) on the report when the user selects "All". Below is what I have achieved so far:

$Locations:

Name: USA Value: USA

Name: Mexico Value: Mexico

Name: All Value: All

:

On the filter:

if($Location = 'All', 1, if(CO$Interaction.Location = $Locations, 1, 0))

Type: Constant

Operator: equals 

Value:1

When the user selects All, the report does not display the ones with No Value. I've tried to add "No Value" as another item on the user defined list, but it does not work