odata filter for null values

Hi Folks,

we have created odata services for calculation script views.

now in the json format links we want to filter values for Indicator = 0 or null

however everytime we try to pass this values to the weblink it doesnt work and brings out all the values.

any recommendation on how to filter them?

e.g.

Test.xsodata/M?filter=INDC%20ne%20%270%27&$format=json

i have tried -

ne 0

ne null

gt 0 etc.

thanks again for any insights