Best solution for receiving PO with Zero cost or 100% line discount

Hi folks,

Any suggestions for setting Nav up to receive PO with Zero Cost or 100% discount. I would suggest the setup would need to be parameterized so that it is only allowed for particluar vendors? Note that item being recieved is usually a salable item with unit cost and RRP.

This would be done to to accept stocks nearing best before dates.

Regards

use Purchase Price.