Remove 1 value from legend in graph

[Kirsten]

I want to create 1 graph where I would like to hide 1 value from the legend. If I do this by creating a dimension it messes up my graph. So I would like to find a way to do this by maybe adding an expression. 

See attachment for example. Service area 4 should be removed from my graph, and the second image shows the error when using a dimension for the selection in the graph

[jochem_zw]

in your expression use something like:

Count({$<ServiceArea-={'Service area 4'}>}Defects)

[Kirsten]

Thanks.  I cannot add an expression in my dimension under data on the right side, because there is already a dimension change from master items applied. See attachment 

[jochem_zw · Accepted solution]

just change your current expression like the one i gave to you, don't change or add dimensions

[Kirsten]

Sorry for the delay in response. This one works thanks!