Freight Issue in PO and Migo

HIii Experts ,

I Create one PO in ME21N , quantity is 2000 and freight value(FRB1) is  500 and save

now goods Receipt in MIGO , receive  Quantity is 1000  show freight value is 250 bt client requiremnt is  freight value  show 500 in migo because PO show fright value is 500.

How it is Possible ????

Regards

Pawan