If... in - multiple values

Hi,

I have the following statement in a formula:

if not ({pool_bearbeit.typ} in [200,401,409,410,411,413,420,450]

The numbers are processes, constantly added or deprecated.

To make this more manageable and visible, I'd like to be able to dynamically display these numbers in the page header, to confirm to the User what is actually being chosen.

I believe I've seen code where a single value is entered as a parameter, and then passed through to the report, invisible to the User, but the setup eludes me, and I don't know if that can be done for multiple values.

What method can I use to do this?  I imagine it's possible, but the syntax eludes me.

I would need an option for both numerics and strings.

Thank you.