ICPs with value set validation on input values

Summary:

Value sets for ICPs can't use PARAMETER.SysEffectiveDate , so what parameter can you use to limit the value set based on an effective date?

Content (please ensure you mask any confidential information):

I have created an element with an input value called "Grades" and I want to use a table value set to limit the values to grades that are still active as at the date the element is created. The SQL I used for the where clause initially was:

:{PARAMETER.SysEffectiveDate} between grades.effective_start_date and grades.effective_end_date

This works fine if you create element entries via the payroll screens, but when you hook the element up to an ICP the drop down boxes don't return any values.