Auto Invoice - Transactions Source - Fulfillmentof Order Lines

Hi,

Currently Transaction sources configuration is checked to derive GL date and the data that is coming from Order Management lines has ship date.  In the absnece of invoicing and accounting rules, the system looks at ship date and derives the GL date.

We have a specific order type where only after fulfillment of all order lines the customer can be billed.  Individual lines can be shipped at different times due to back orders etc.,

The question is when all lines are fulfillled, lines gets closed and order gets closed and order lines get pushed into auto invoice interface table.  We want to import all these lines which have different shipping dates into one invoice, and what will be GL date for the invoices.