Regarding shipment doc , TPP, AVC,

HI SAP Experts,

1.) Is the Data at header levels alwas applies to all the items? Where it will not apply .

2.) Availbility Check is carried out in the Order or not and whereelse the availbility check carries out

3.) Can Credit memo Request be created w.r.t order?

4.) What is shipmnt doc and Shipment Cost doc. How many Shipment Cost doc can be created for every shipment doc.

give ex like this plz , Is 1 shipment Cost = 1 Shippment doc?

5.) Can Several Transportation Planning Pts assigned to a Company Code? In IMG , where i can see this.