Planning at Sub-Assy Phantom Level - Work order&Sales order FG Level

Hi everyone,

I'm searching for a way of setup my SAP to have my MPS loaded at the sub-assy(phantom) level and my work orders/sales orders loaded at the FG assy level.

Loading the MPS at the sub-assy and exploding requirements to the components are working fine, the issue is that I need to create a work order/sales order on the FG assy level to be able to backflush the components, create FG stock and sell the product. When I create a work order on the FG assy level SAP is adding additional dependent requirements on the raw material level, duplicating the demand some times,I would like to avoid that. Iwanted to keep just dep requirements generated by the FCST loaded under the Phantom Sub-assy level........Do you have any ideas on how to solve this? Thanks