SSRS Tablix Properties - Filter By In/Not In Multiple Items

We have two tables in our report and the logic should be as follows:

if we click on the table to see the filter it looks as follows the expression reads: =mid(Fields!perf_code.Value,3,1)
where the third character in our perf code is G then return that row here. what we need to do is say where the third character in our perf code is in G or V then return the rows.

I've tried to make it look like this and like this and like this

none of it seems to be working. I don't know how to say if the perf code (3 character) is in multiple values in our case G or V then return the row. I have a second output set/tablix where the value should be not <> or not in and that too isn't working.

In short, we need to return all the rows where the 3 character equals multiple possible things, I need to be able to identify all of those values.

Thank you.

Try setting the filter expression to

= (MID(Fields!perf_code.Value,3,1) = "G" OR MID(Fields!perf_code.Value,3,1) = "V")

Then set the Operator to =

And finally set the filter expression to value to =True. You need to click the [fx] button

And then set the expression to =True