For a purchase order, should the old dock date match the need by date in the PWB and the PO need by

Hi,

Note: profile "MSC: Purchase Order Dock Date Calculation Preference" = Need By Date.

After a full data collection and plan launch.

In source the PO need by date = 26-Jun-2018

In PWB the fields have the following dates for a purchase order:-

Need by date = 26-Jun

Old Dock Date = 12-Jun

I was expecting the PWB old dock date to match the PO source and PWB need by dates, so I was expected them all to be the 26-Jun.

The dates don't currently match, as the example above shows, so I am getting Schedule Out messages when I don't think there should be any!