Can anyone explain to me why cluster warehouse can not be a nettable warehouse ?

Many thanks in advance.

DRP functionality.
Cluster warehouse is a Distribution Warehouse supplied by another warehouse

In the Bill Of material session, there is a warehouse for us to maintain. When I enter a cluster warehouse (non-nettable) warehouse, I got a note as follow:

Warehouse is 'non-nettable' and sub-item is of type 'Planned'

What is the meaning of this note. What is the consequances if I ignore this message ?

Thanks in advance.

Just a warning. Asume the SFC order was created manually.
This should be fine. Planned order will be a warehouse order when the PO item is needed if the supplying relations are set

In EP only Nettable Warehouse is considered. Thats the reason it is giving error