How to invoice Free good item (non-Stock) and main stock item at the same time

Hi Team,

We attach a Free good item (Non-stock) to the main stock item using the standard Free good functionality.

The Free good line is created at 520-580 status as its a non-stock item and we are not ready to ship confirm the free good line.
And the stock item will be created at status 520-540 and follow the next steps, like Print pickslip (540-560), Shipment confirmation(560-580) etc.

The issue is that, we run the Invoice print R42565 in the scheduler to pick the orders which are in next status 580. Due to this, the free good line is getting invoiced before the main stock item is ship confirmed.