Project manufacturing - Question about process

Hi All,
I am trying to represent the following scenario in a project:
Finished Product (FP)
---RM1 (raw material 1)
---RM2
---semi-finished assembly 1 (SF)
RM3
RM4
We have to assemble FP in the project. If I assign only FP as a material component in the project and run MRP, the system successfully generates planned orders for SF, RM1, RM2, etc.... I can then convert planned orders into purchase requisitions or production orders and do all consumption postings.
But, I want to represent the assembly process in the project, and I think the below assignment should be possible.
WBS
---Network
Activity 1
RM3
RM4
Activity 2
SF1 (-1 - negative quantity)
Activity 3
RM1
RM2
Activity 4
FP (-1 - negative quantity)
The negative quantity should mean that the specified component (SF1 or FP) is assembled in that network activity. However, when I have a negative quantity in the component, MRP is not generating the planned order for that material. Also, it's generating redundant planned orders for RM1, RM2, etc... - once for the reservation for that component and once by exploding the reservation for SF1 or FP. Should I have the reservation / purchase requisition indicator for the individual components set as Never? In that case, do I just post consumption to the respective network activities when the respective RM* is received to stock? Any input you could provide would be greatly appreciated.

Hello Ahmed,
My ultimate goal is to produce FG, right? Now, I am using PP as well. I am trying to figure out what level of BOM should be represented in the project using component assignments also using MRP to create the corresponding procurement parameters. I was asking about the production order for FG, because Mahendra's solution doesn't create a production order for the FG due to the negative quantity in the project. I think he answered that part of the question saying that for the FG, the network acts as the production order and delivers FG to stock. Am I correct? Please let me know.
My explanation may be a little confusing, but please let me know if you need any further clarifications to solve the problem .

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