Inventory SCM: Is there a way in SCM to create a user-defined demand that does not reserve stock?

Summary:

Hi, we need to create in Oracle Fusion SCM demands that represents an external system sales order but without creating a Sales Order in SCM.

We only need the demand of the items in order to make planning in the stock. It can occurs that there are not onhand quantities yet in stock.

So we need to create user defined demands but without reserving the stock.

Is there a way in Fusion SCM to create this concept of "User-Defined-Demand" than doesnt reserve the stock but is taken on account in the planning processes? (min-max, MRP, etc)

Thanks in Advance.