Is it possible to overwrite default prompt value while scheduling AO Workbook?

Hello Experts,

My workbook has a Bex variable for "Region" with default value "East", When I schedule the workbook it  successfully for East region as expected.

How do I schedule the same workbook to different region (Ex: West or South) ?

I tried Prompt option to schedule with a different value "West" but still it schedule for "East" - It doesn't help.

Thanks in advance,

Naresh