Lot level Reservation during Sales Order Line creation / booking

Dear All

Version - 11.5.10 CU2+

Can you please provide your thoughts on the following :

Item A has 2 lots L1 and L2 available as Onhand with Quantity as 5 and 10.

SO is created for Item A with quantity as 8.

The customer on SO can accept only lot L1.

The requirement here is that the system should reserve only 5 units and make a reservation at lot level. How does this can be done during order line entry / booking ?

We are aware of OE_RESERVE_CONC_HOOK ( ) which can return the specific quantity to be reserved for a given order line. But, how do we reserve the lot as well as part of that process ?  We can think of using inv_reservation_pub.create_reservation ( ), but is this is a right API and at what point this need to be called ?