Hi,
Do you mean change value for condition type freight price ?
If so, in configuration pricing procedure for PO, there some places where you can create your own formular / requirement for condtion type and you can add your code there.
I used to do the same in SD module, but still not do in MM module. you can try ,maybe it help.
Please tag this with MM in addition to ABAP. I strongly suspect there is an alternative solution possible using configuration that does not actually require ABAP.
I've also seen similar questions ("split" header pricing condition among the line items) discussed in SD but I'm not following the MM forum usually. Both use similar condition technique though.
according to OSS note 456691 - FAQ: Price determination in purchasing
Q&A 11 has a price determination to be carried out manually item for item.
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