SNP Network Heuristic - Purchase Requistion planned w/out source of supply

Dear Experts,
We have a T-lane setup from the source location A to destination B for a particular material.  However, when running SNP Network heuristic, it generated SNP Purchase Requisition with out a source of supply.  Can you please help me understand what would caused this?
Thank you so much for your input.
Tom.

Hi Satyajit,
My situation is we have two T-Lanes:
Tlane 1 - Source A  Destination B
T lane 2 - Source B Destination A
I believe that in Network heuristic system does not allow any recursive T lane as it fails to determine low level code resulting no propagation of  demand to next level.  This resulted in no source of supply.
Can you please confirm if that is the limit of Network Heuristic?  Our business scenario required to have recursive Tlane, is there a way to get Network Heuristic to work correct?  How to setup low level code?
Thanks for all your help.
Tom

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