Neha,
So, freight price is for CIF or FOB?
I assume your sales incoterms is CIF & both deliveries are shipped together from forwarding agent. (Where, you are not following shipment doc process in SAP for 2 deliveries.)
Based on my understanding, I have prepared the following grid:
In that case, for Required Freight Distribution, you might have to develop routine for calculation type, where it would consider frieght condition type value from Sales Ordre. May be best one.
FYI, if you would have used combine shipment doc for these delivery and freight would have calculated accordingly.
If in case of any concern, do revert back.
Regards, JP