Delivery date for a WO tsf type

Hi,

Is it required to populated the delivery_date column in tsfhead table for a tsf type 'WO'? What is the use of it? We already have wf_need_date column being populated with need date of a WO. The Data model says, delivery_date is required for PO linked transfer. But not sure why RMS populates it for WO transfers. Kindly let us know.

Thanks,

Karthika