http://help.sap.com/saphelp_46c/helpdata/en/dd/560fb6545a11d1a7020000e829fd11/content.htm
http://help.sap.com/saphelp_46c/helpdata/en/dd/560f63545a11d1a7020000e829fd11/content.htm
Follow the above links and it will answer basic questions about collective billing & Invoice split.
As a rule, the system combines into one billing document all transactions for the same customer, default billing date and sales organization
An order contains terms of payment at header as well as item level. These are stored only at header level in the billing document, however. If there are different terms of payment in the reference documents, an invoice split will always be made.
If data from the related reference documents differs in the item fields of the billing document, the system does not split the invoice.
The order basis is stored at header level in the order and at item level in the billing document. The system does not split the invoice. If you require an invoice split, you must first define the appropriate split requirements in Customizing for copying control. Copying control depends on the following criteria:
o Billing Document Type
o reference document type (i.e. type of order, delivery or billing document on which the sales document is based)
o item category in the reference document
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