Hi
I would suggest you to user order instead of lot fot lot if you want to achieve this:
AUTOMATIC RESERVATIONS
The item card can be set up to always be reserved automatically from demand, such as sales orders. In that case,
reservation is made against inventory, purchase orders, assembly orders, and production orders. A warning is issued if
supply is insufficient.
In addition, items are automatically reserved by various planning functions to keep a demand linked to a specific supply.
The order tracking entries for such planning links contain Reservation in the Reservation Status field in the Reservation
Entry table. Automatic reservations are created in the following situations:
A multilevel production order where the Manufacturing Policy field of the involved parent and child items is set to
Make-to-Order. The planning system creates reservations between the parent production order and the underlying
production orders to ensure that they are processed together. Such a reservation binding overrides the item’s
default costing and application method.
A production, assembly, or purchase order where the Reordering Policy field of the involved item is set to Order.
The planning system creates reservations between the demand and the planned supply to ensure that the specific
supply is created.
A production order created from a sales order with the Sales Order Planning function is linked to the sales order
with an automatic reservation.
An assembly order created automatically for a sales order line to fulfill the quantity in the Qty. to Assemble to Order
field. This automatic reservation links the sales demand and the assembly supply so that sales order processors can
customize and promise the assembly item to the customer directly. In addition, the reservation links the assembly
output to the sales order line through to the shipping activity that fulfills the customer order.
In the case of supply or demand that is not allocated, the planning system automatically assigns a reservation status of
type Surplus. This could result from demand that is due to forecasted quantities or user-entered planning parameters.
This is legitimate surplus, which the system recognizes, and it does not give rise to action messages. Surplus could also
be genuine, excess supply or demand that remains untracked. This is an indication of an imbalance in the order network,
which causes the system to issue action messages. Note that an action message that suggests a change in quantity
always refers to type Surplus. For more information, see the “Example: Order Tracking in Sales, Production, and
Transfers” section in this topic.
Automatic reservations that are created during the planning run are handled in the following ways:
They are applied against item quantities that are part of the availability calculation, as are manual reservations. For
more information, see the “Offsetting in Reservations” section in this topic.
They are included and potentially changed in subsequent planning runs, as opposed to manually reserved items.
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