Invoice Split
As a rules, the system combines into one billing document all transactions for the same customer, default billing date and sales organization. If data from the related reference documents differs in the header fields of the billing document, the system will automatically split the invoice.
An order contains terms of payment at header as well as item level. These are stored only at header level in the billing documents, 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.
大的原则就是，抬头数据数据要一致，否则拆分。特例是付款条件。
还有一则就是，原先存储在销售订单抬头的数据，在billing时存储在行项目上的，不做为拆分条件。
自定义的拆分规则在复制控制中设置。
本人英文不行，以上纯属猜测，没有经过测试。
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