SO分批出货，从Delivery Orders生成销售发票出错，求解？

[linuxer]

环境：ubuntu + OE7

某一销售订单分批出货，按照前辈的指示，应该将相关的Delivery Orders选上，然后生成Draft Invoice.

操作到生成INV时系统报错(none of these picking lists require invoicing)，请问是不是哪里操作有误呢？

P.S.
Invoicing 设置，有勾选 Generate invoices after and based on delivery orders