Dear,
Inter Company Invoice having two Invoices ,one is Customer Invoice and Inter Company Invoice .These both Invoices related to only one Item category why because we have one Sales doc type ,it will be bonded with Item category .No,this Sales doc.type having two Billing Types as F2 or F1 and IV .
If there are two Invoices then we can call it as Inter Company Process If not dont want call it as Inter Company Process .
Now ,coming to the Point is ,
1. If you dont want Inter company Invoice then simply remove the IV from Sales doc type .
2. If you want IV then you need to maintain it in Sales .doc type .If you want IV with no price ,it doesnt have sense less in SAP .
3.In inter Company Process ,Schedule Line Category having very IMP why because It is having two Movement Types ( it is assigned to Sales doc type ) depends upon requirement one step or two steps .
Note : Please let me know ,how you are doing Inter Company process .
Thanks,
Naren