Create clearing invoice lines by autoinvoice.

Hi, 

Is there any way to create clearing invoice lines to the standard invoice which creating by Autoinvoice.

Detail : in OM after closed SO , Autoinvoice create invoice with distribution Receivable(Customer) and Revenue Accounts according to the setup of transaction type.

We need for specific :-  batch source , transaction type(AR), Order type(OM)

to create automatically two distribution line of class SUSPENCE(CLEARING INVOICE) for the upper case almost we have account numbers and the value must be 20% of total invoice.

Please try to help us for this issue by any way(setup, customization,....etc).

sorry for my english langauge.