My apologies, I didn't pick up the fact that you have these as all Form based parameters. I don't believe you can create the dependent checks with Form based parameters. Probably need someone to check me on that, JackLacava ?
You could have the dependent member in the row or column and it will resolve correctly; I just tested that. Although this would display all members that meet your contains criteria, it would not limit it to one selection.
Alternatively, you could move these to dashboards where you have control over component refreshes which will ultimately allow you to achieve your goal of dependent parameter selections. This is what we do and we utilize combo boxes with dependent parameter selections.
I'd welcome others input on this thread in the event there are ways to achieve your goal while still utilizing Form based parameters.