Can anybody give me the solutions for these

In the definition of Item Catogory vov7, thers is a field " Relevent for Delivery", The same field is there in the definition of Scheduleline catagory vov6.

1. Y the same field is there in both definitions?

2. If I didnt check the field in item catagory definition, then item cannot be deliver?

3.Y should we check in itemcatagory and scheduline catagory definition the field " relevent for delivery"

If i check in Item catagory , if i didnt check in scheduline catagory any problem occurs at the time of delivery

Plz reply me for these questions

Thanks in Advance

Venkat Ramana