MRP Not Running on Subcontracting Material

Hi All,
I have done the following :-
Created a SUBCON Component with all the correct views, procurement type 30 etc.
Created a RAW Material again with all the correct views.
Created a BOM for the Above.
Created Subcont PIR for SUBCON Material
Created Standard PIR for RAW Materal.
Sourcelist for both.
When I create a PO ME21N i can see the BOM explosion etc so Subcon works fine.
The problem is if i want to maintian safety stocks for the SUBCON Component and run MRP it doesn't generate any Planned Orders/Purchase Reqs?
Why is that?
If i maintain safety stock for the RAW Material and run MRP it generates me reqs which is correct but why doesnt it do the same for SUBCON Material?
Thanks

Hi,
Issue Resolved,
I removed forward consumption and backwards consumption and MRP is working now.
Forward and backward consumption has nothing to do with safety stock level. MRP will plan with your safety stock even if you write values in those fields.
Forward and backward consumption comes into picture when you want to set the system how SOs should consume PIRs.
So, I do not think you fully described your original situation since merely setting forwar/backward consumption periods to zero cannot solve this issue as per my best knowledge. I've tested the same and those fields have no effect on how MRP considers safety stock.
BR
Csaba

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