Report SAVEASPDF set option /filter on request page

Hi all,

I have written code which does a SAVEASPDF on the aged account receivable report. So far so good, code works.
But what I see is that the "Aged of" date is not the currect or workdate, what I would like it to be.
It's an option defined on the requestpage.

I have tried and searched how to set this field. Probalbly it goes through a report variable.
Could you give me a hint how to access this field in code?

Thanks,

Rob