On Time Delivey and reason coding for late

Were on ECC 5.0 and looking at trying to link "reasons" for late delivery to the SAP shipment. Has anyone done this or have any suggestions on ways to configure list of "reasons" and how to link them to the shipment number? In 3.1i we had a way to do this with deadline funcitons and reason codes but it seems to have disappeared in 5.0.

Tim