Internal sales order working similar to back to back orders?

Hi All,

I have a requirement which is as follows

The Inventory org in Singapore raises an IR for item A (Qty:50 EA) where the source organisation is Melbourne Inventory Org. This item is not stocked in Melbourne Inventory org, so an IR is raised in Melbourne Inventory org with source org as Sydney Inventory organisation.

The business rule is such that Melbourne takes care of all international shipments and Sydney for domestic shipments.

So is there anything similar to Back to Back sales order which can be incorporated in Internal sales orders.

Ie, If an Internal sales is raised with source organisation as Melbourne and for the particular item, another internal sales order is raised automatically with source org as Sydney?