Field help (DLVHOU) 

The two fields Exp. delivery time and Max delivery time are initialized to the Exp. delivery time entered in the header.
The Max delivery time field is subject to the EDIX3 activity code.
As a general rule, these fields can be modified: you use them to define a delivery time slot.
In the following cases however, this information is automatically loaded and cannot be modified:

In the case of orders received by EDI, the BOM and 'free item' lines are not generated automatically. Lines are imported individually. However, if a modification is applied to the component or source product of the 'free item', this modification will be also applied to the component and free item lines.