Original Demand Retention-Location Substitution

Hello Experts,

I have a requirement wherein the demand should be captured at the original location rather then at the substituted location.

To explain you with eg:

Location-L1

Location-L2

Product-P1

Placed an order of 100 at L1

I have a location substitution rule which has been set up that if the stock is not available at L1 then fulfill the order from L2

So as per the rule the system checks the stock at L2 and gives the schedule lines at L2

Though the order can be fulfilled by location L2 but I want the demand to be captured at L1 because the order was originally placed at L1.

How can I achieve that. Any tips would be helpful.

Thanks

Karan