Supplier/Carrier calendars for inbound shipment

Hello,

I am trying to make inbound shipment work w.r.t non working days at supplier and carrier. I have setup the supplier and carrier calendars as calendars for the B/P (where the purchase order is being placed) with type SUPPLIER and CARRIER and their address numbers in the Calendar name field, and shift code as 1.

When creating a purchase order with request date populated in future, system is calculating the promised ship date only on basis of the transit days on the route and not considering the non working days on either carrier or supplier calendars.

Could anyone from you point me to something I might be missing? Thanks a lot.