OBN Navigation Parameter Name Importance

Hi,

So on an OIF for a custom BO, I decided to set up a 'Basic View' button to go from the OIF to the QA, as none is generated automatically á la the View All button.

I got it working with the following settings:

Interestingly, if I do so much as change the parameter name in the outport to 'Parameter', it ceases to work. Why, what's the significance?

Thanks,

Lewis