What is this:
Whether the placement is on a certain roster.
Value will be returned:
Y - if the placement is configured to on a particular roster within the payroll period.
N - if the placement does not belong to the specified roster.
Company want to issue $1000 attendance bonus for roster "R12" only, you can have pay type for Attendance Bonus and set a formula like this:
IIF ('[ON_ROSTER(R12)]'='Y', 1000,0)
It will return "Y" if the staff has roster "R12" by the end of the payroll period. And therefore returning the 1000 as pay amount.
You can also use | to check for multiple internal grades. For example,