Regarding Frieght value-Urgent

Hi all MM guru's

my client has an specific requirment

we have already maintained the condition for frieght at header level (value based & qty Based),that is working fine

but some times what happend we recieved the goods for same PO and every time we have to pay the Fixed Frieght charges to vendor ie that frieght is independt upon value and qty as well when vendor delivers the good to us we have to pay the charges

how would have to maintaned this scenario in SAP

helpful suggestion would get rewarded immidiately

thanks in Advance