How to amend the SO-SalesOrder Generic inquiry so a filter can be added to show only sales orders which contain an order line for an inventory item of a specific class?

I’m new to using formulas in Generic inquiries, and I’m struggling find a way to add a field in the result grid of Generic Inquiry SO-SalesOrder that flags an order as ‘Provision’ if any of the stock items in SOLine belong to an item class of IC0004.

I would then add a filter to the GI that shows only orders with ‘Provision’ in this column.

Would anyone be able to advise how to do this?

Any advice very much appreciated.

Many Thanks