Managing consignment stock

[alvaro_pedrosa]

Hi
At my company we manage consignment stock, and the way we do it is:
- we place orders
- order arrives and we enter the material in stock (K)
- when we have quantity to be expedited in the current month we transfer it to a customer order.
- the above transfer starts the billing proccess

The above method causes some difficulties, such as:
- we can't "reserve" pending arrival material
- even if we have material in stock but it's for a later delivery we can't transfer it to a customer order or else it will be billed
- we don't have a way of knowing current free material in SAP (reserved but not transfered to customer order)
- we have to manage pending arrivals and current stock reserves in Excel

So is there a proper way to manage consignment?
Pending arrivals, non-transfer reserves and stock management

Thanks