How to set Sysdate+16 as Effective Date on HCM Extract?

Summary:

I'm doing it wrong somehow but I cannot tell why.

Content (required):

I need to run HCM Extract on daily basis with effective date sysdate + 16.

On Refine Extract I have this setup:

When I go to "Submit a Payroll Flow" to submit a new scheduling I have this problem:

This query is not valid as Effective Date parameter. If I select here a date from the calendar it won't change day by day, the schedule will simply run with a fixed date. If I make this parameter not mandatory and leave it blank the run will return error.

What should I do?