How to Default Payroll Frequency based on Requisition DFF Redwood?

Summary:

We are working in Oracle Recruiting – Redwood and are trying to default the Offer → Payroll Frequency field based on a Job Requisition DFF.

We configured a VB Studio defaulting rule and are sourcing the value from:
Initial Field Values → Requisition Details → Requisition DFF → payroll relationship ($fields.RecruitingJobRequisitionDetails.requisitionDFF.payrollinfo.$initialValue()).

However, when testing, the Payroll Frequency field on the offer is not defaulting.

Is this approach supported in Redwood?

If so, should we be referencing a different attribute from the DFF (for example the value/code rather than the label), or is there additional configuration required for this to work?